x + 400 = 500 - 100
K
Khách
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19 tháng 1 2017
x - 200 = 600 + 200
x - 200 = 800
x = 800 + 200
x = 1000
Vậy x = 1000
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NT
10
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19 tháng 1 2017
1 x 1 = 1
5 x 2 = 10
5 + 4 = 9
67 x 12 = 804
k mk nha
thank you
DV
11
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x + 400 = 500 - 100
x + 400 = 400
x =400 - 400
x = 0
Vậy x = 0
x + 400 = 500 - 100
x + 400 = 400
x = 400 - 400
x = 0