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4/5 + 3/4
= 16/20 + 15/20
= 31/20
8/3 + 10/7
= 56/21 + 30/21
= 86/21
a. \(\dfrac{-3}{21}\) + \(\dfrac{-2}{7}\) + \(\dfrac{1}{3}\) = \(\dfrac{-3}{21}\) + \(\dfrac{-6}{21}\) + \(\dfrac{7}{21}\) = \(\dfrac{-2}{21}\)
b.
9/5 + 5/8 = 72/40 + 25/40 = 97/40
3/5 + 13/9 = 27/45 + 65/45 = 92/45
2/3 + 11/2 = 4/6 + 33/6 = 37/6
9/4 + 17/20 = 45/20 + 17/20 = 62/20 = 31/10
43/6 + 45/8 = 172/24 + 135/24 = 307/24
5/9 + 7/15 = 25/45 + 21/45 = 46/45
2,5 - 3x =5,5.20200
2,5 - 3x = 5,5.1
2,5 - 3x = 5,5
3x = 2,5 - 5,5
3x = -3
x = -3 : 3
x = -1
b
Vì glasses nghĩa là cái kính ( kính có 2 mắt nên có es )
glass nghĩa là cái ly
Nửa chu vi mảnh đất hình chữ nhật là:
90 : 2 = 45 (m)
Chiều rộng mảnh đất hình chữ nhật là:
45 : (2 + 3) x 2 = 18 (m)
Chiều dài mảnh đất hình chữ nhật là:
45 - 18 = 27 (m)
Diện tích mảnh đất hình chữ nhật là:
18 x 27 = 486 (m2)
Diện tích trồng rau là:
486 x 20% = 97,2 (m2)
Diện tích trồng hoa là:
486 : 9 x 2 = 108 (m2)
Diện tích trồng cây ăn quả là:
486 - 97,2 - 108 = 280,8 (m2)
Đáp số:...
( 2x - 5 ) + 17 = 6
2x - 5 = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2
x = -3
2/5 = 0,4 => Ko phải là số tự nhiên