tinh
(1.35:0.54*4.2-5.5):(7.2-4.7)
2gio55phut+17gio20phut:8
K
Khách
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Những câu hỏi liên quan
OL
0
LB
1
3 tháng 5 2016
a. ( 2.5 x -1.3 ) : 2.5
= -3.25 : 2.5
=-1.3
b.= 2h55' + 2h10'
= 4h65'=5h5'
MA
12 tháng 2 2016
bài 1:
A, cách 1: (6,75+3,25)*4,2
=10*4,2 =42
cách 2 : (6,75+3,25)*4,2
= 6,75 * 4,2 + 3,25*4,2
= 28,35 + 13,64
=42
câu B tương tự
bài 2
A, 0,12 *400 = 0,12 * 100*4 =12*4 =48
B, 4,7*5,5-4,7*4 = 4,7*(5,5-4)=4,7*1,5=7,05
20 tháng 8 2019
làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người
LT
1
NN
5 tháng 9 2016
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height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300">
CD
1
VT
23 tháng 8 2016
a) 6,3 + (-3,7) + 2,4 + (-0,3)
= (6,3 + 2,4) + [-3,7 + (-0,3)]
= 8,7 + (-4)
= 4,7
b) (-4,9) + 5,5 + 4,9 + (-5,5)
= (-4,9 + 4,9) + [5,5 + (-5,5)]
= 0 + 0
= 0
c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2
= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7
= 0 + 0 + 3,7
= 3,7
d) (-6,5) . 2,8 + 2,8 . (-3,5)
= 2,8 . [-6,5 + (-3,5)]
= 2,8 . (-10)
= -28.
CC
2
11 tháng 5 2016
(1,35 : 0.54 * 4,2 - 5.5 ) : ( 7,2- 4,7 )= (2,5*4,5 - 5,5) : 2,5
= (11,25 -5,5) :2,5
=5,75:2,5
=2,3
11 tháng 5 2016
2 giờ 55 p = 175p
17 giờ 20p = 1040p
175+1040 :8 = 175+130=305
A
0
