40%x-30%=20
4个回答
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解:解方程, 此方程的解为x = 203/4,【即x = 50.75】
百分之40x-百分之30 = 20
(40/100)x - 30/100 = 20
(2/5)x - 3/10 = 20
(2/5)x = 20 + 3/10
(2/5)x = 200/10 + 3/10
(2/5)x = 203/10
x = 203/10 ÷ 2/5
x = 203/10 × 5/2
x = 203/4
∴x = 50.75
答:此方程的解为x = 203/4,【即x = 50.75】
百分之40x-百分之30 = 20
(40/100)x - 30/100 = 20
(2/5)x - 3/10 = 20
(2/5)x = 20 + 3/10
(2/5)x = 200/10 + 3/10
(2/5)x = 203/10
x = 203/10 ÷ 2/5
x = 203/10 × 5/2
x = 203/4
∴x = 50.75
答:此方程的解为x = 203/4,【即x = 50.75】
展开全部
40%x-30%=20
0.4x=20+0.3
X=20.3÷0.4
x=50.75
0.4x=20+0.3
X=20.3÷0.4
x=50.75
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