60x-(20-x)×40=700怎么算?
3个回答
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解:解方程, 此方程的解为x = 15
60x - (20 - x) × 40 = 700
60x - (20 × 40 - 40x)= 700
60x - (800 - 40x)= 700
60x - 800 + 40x = 700
100x - 800 = 700
100x = 700 + 800
100x = 1500
x = 1500 ÷ 100
x = 1500 × 1/100
x = 1500/100
∴x = 15
答:此方程的解为x = 15
60x - (20 - x) × 40 = 700
60x - (20 × 40 - 40x)= 700
60x - (800 - 40x)= 700
60x - 800 + 40x = 700
100x - 800 = 700
100x = 700 + 800
100x = 1500
x = 1500 ÷ 100
x = 1500 × 1/100
x = 1500/100
∴x = 15
答:此方程的解为x = 15
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