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câu 1:
1 km nặng là
16 : 0,8 =20 (kg)
thanh sắt dài 0,18 km dài là
20 x 0,18 =3,6 (kg)
đáp số 3,6 kg
câu 2:
Có số chai dầu là: (21+15) : 0,75 = 48 (chai)
câu 3:
Diện tích hình vuông là:
25 x 25 = 625 ( m2 )
Chiều dài thửa ruộng hình chữ nhật là:
625 : 12,5 = 50 ( m )
Chu vi thửa ruộng hình chữ nhật là:
( 50 + 12,5 ) x 2 = 123 ( m )
Đáp số: 123 ( m )
1 m sắt nặng :
16 : 0,8 = 20 ( kg )
0,18 m sắt nặng:
20 x 0,18 = 3,6 ( kg )
Đáp số :..............
Có tất cả số lít dầu là :
21 +15 = 36 ( l )
Có tất cả số chai dầu là :
36 : 0,75 = 48 ( chai dầu )
Đáp số :..........
Diện tích hình vuông là :
25 x 25 = 625 ( m2 )
Chiều dài thửa ruộng hình chữ nhật là :
625 : 12,5 = 50 ( m )
Chu vi thửa ruộng hình chữ nhật là :
( 50 + 12,5 ) x 2 = 123 ( m )
Đáp số :...........
Giải
Số lít dầu trong can cân nặng là :
21,65−1,4=20,25(kg)21,65−1,4=20,25(kg)
11 lít dầu cân nặng là :
20,25:27=0,75(kg)20,25:27=0,75(kg)
1010 lít dầu cân nặng là :
0,75×10=7,5(kg)0,75×10=7,5(kg)
Sau khi lấy đi thì lượng dầu còn lại cân nặng là :
20,25−7,5=12,75(kg)20,25−7,5=12,75(kg)
Đáp số :12,75kg12,75kg
Đây là dạng toán tỉ lệ nghịch.
# Chúc bạn học tốt!
phân biệt sắt thái ý nghĩa của các từ gần nghĩa trong nhóm từ sau : thanh bạch ,thanh dam, thanh cao
một lít dầu cân nặng là :
2,66 : 3,5 =0.76 (kg )
5 lít cân nặng là :
0.76 * 5 = 4 . 5 0 (kg)
đáp số : 4.50 kg
Vào thời giặc Minh đặt ách đô hộ ở nước Nam, chúng coi dân ta như cỏ rác, làm nhiều điều bạo ngược, thiên hạ căm giận chúng đến xương tủy. Bấy giờ ở vùng Lam Sơn, nghĩa quân nổi dậy chống lại chúng, nhưng trong buổi đầu thế lực còn non yếu nên nhiều lần nghĩa quân bị thua. Thấy vậy, đức Long Quân quyết định cho nghĩa quân mượn thanh gươm thần để họ giết giặc.
Hồi ấy, ở Thanh Hóa có một người làm nghề đánh cá tên là Lê Thận. Một đêm nọ, Thận thả lưới ở một bến vắng như thường lệ. Khi kéo lưới lên, chàng thấy nằng nặng, trong bụng mừng thầm, chắc là có cá to. Nhưng khi thò tay vào bắt cá, Thận chỉ thấy có một thanh sắt; chàng vứt luôn xuống nước, rồi lại thả lưới ở một chỗ khác.
Lần thứ hai cất lưới lên cũng thấy nặng tay; Thận không ngờ thanh sắt vừa rồi lại chui vào lưới mình. Chàng lại nhặt lên và ném xuống sông. Lần thứ ba, lại vẫn thanh sắt ấy mắc vào lưới. Lấy làm quái lạ, Thận đưa lại mồi lửa nhìn xem. Bỗng chàng reo lên:
– Ha ha! Một lưỡi gươm!
Về sau Thận gia nhập đoàn quân khởi nghĩa Lam Sơn. Chàng hăng hái gan dạ không nề nguy hiểm. Một hôm chủ tướng Lê Lợi cùng mấy người tùy tòng đến nhà Thận. Trong túp lều tối om, thanh sắt hôm đó tự nhiên sáng rực lên ở xó nhà. Lấy làm lạ, Lê Lợi cầm lấy xem và thấy có hai chữ “Thuận Thiên” khắc sâu vào lưỡi gươm. Song tất cả mọi người vẫn không biết đó là báu vật.
Một hôm, bị giặc đuổi, Lê Lợi và các tướng chạy tháo thân mỗi người một ngả. Lúc đi qua một khu rừng, Lê Lợi bỗng thấy một ánh sáng lạ trên ngọn cây đa. Ông trèo lên mới biết đó là một cái chuôi gươm nạm ngọc. Nhớ đến lưỡi gươm ở nhà Lê Thận, Lê Lợi rút lấy chuôi giắt vào lưng.
Ba ngày sau, Lê Lợi gặp lại tất cả các bạn trong đó có Lê Thận. Lê Lợi mới đem chuyện bắt được chuôi gươm kể lại cho mọi người nghe. Khi đem tra gươm vào chuôi thì vừa như in.
Lê Thận nâng gươm lên ngang đầu nói với Lê Lợi:
– Ðây là Trời có ý phó thác cho minh công làm việc lớn. Chúng tôi nguyện đem xương thịt của mình theo minh công, cùng với thanh gươm thần này để báo đền Tổ quốc!
Từ đó nhuệ khí của nghĩa quân ngày một tăng tiến. Trong tay Lê Lợi, thanh gươm thần tung hoành khắp các trận địa, làm cho quân Minh bạt vía. Uy thanh của nghĩa quân vang khắp nơi. Họ không phải trốn tránh như trước mà xông xáo đi tìm giặc. Họ không phải ăn uống khổ cực như trước nữa, đã có những kho lương của giặc mới cướp được tiếp tế cho họ. Gươm thần đã mở đường cho họ đánh tràn ra mãi, cho đến lúc không còn bóng một tên giặc trên đất nước.
Một năm sau khi đuổi giặc Minh, một hôm Lê Lợi – bấy giờ đã làm vua – cưỡi thuyền rồng dạo quanh hồ Tả Vọng trước kinh thành. Nhân dịp đó, Long Quân sai rùa vàng lên đòi lại thanh gươm thần. Khi chiếc thuyền rồng tiến ra giữa hồ, tự nhiên có một con rùa lớn nhô đầu và mai lên khỏi mặt nước. Theo lệnh vua, thuyền đi chậm lại. Ðứng ở mạn thuyền, vua thấy lưỡi gươm thần đeo bên người tự nhiên động đậy. Con rùa vàng không sợ người, nhô đầu lên cao nữa và tiến về phía thuyền vua. Nó đứng nổi trên mặt nước và nói: “Xin bệ hạ hoàn gươm lại cho Long Quân!”.
Vua rút gươm quẳng về phía rùa vàng. Nhanh như cắt, rùa há miệng đớp lấy thanh gươm và lặn xuống nước. Gươm và rùa đã chìm đáy nước, người ta vẫn còn thấy vật gì sáng le lói dưới mặt hồ xanh.
Từ đó hồ Tả Vọng bắt đầu mang tên là hồ Gươm hay hồ Hoàn Kiếm.
- Danh từ : Nhà, đường sắt, năm, đoạn đường, đá tảng, ốc gắn, thanh ray, trẻ chăn trâu, tàu, tháng, trường, phong trào, quê, học sinh, chuyến tàu, việc, bạn, diều, sự cố
- Động từ : chạy, tháo, ném, phát động, yêu, cam kết, chơi, bảo vệ, nhận, thuyết phục, thả, hiểu, hứa
- Tính từ : chềnh ềnh, an toàn, nghịch, dại
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Thanh sắt 1m có cân nặng là
18:0,75=24(kg)
Đáp số .....