5/12x减20%等于7/15?
1个回答
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解:解方程, 此方程的解为x = 8/5,【即等于x = 1.6】
5/12x减百分之20等于7/15
(5/12)x - 20/100 = 7/15
(5/12)x - 1/5 = 7/15
(5/12)x = 7/15 + 1/5
(5/12)x = 7/15 + 3/15
(5/12)x = 10/15
(5/12)x = 2/3
x = 2/3 ÷ 5/12
x = 2/3 × 12/5
x = 8/5
∴x = 1.6
答:此方程的解为x = 8/5,【即等于x = 1.6】
5/12x减百分之20等于7/15
(5/12)x - 20/100 = 7/15
(5/12)x - 1/5 = 7/15
(5/12)x = 7/15 + 1/5
(5/12)x = 7/15 + 3/15
(5/12)x = 10/15
(5/12)x = 2/3
x = 2/3 ÷ 5/12
x = 2/3 × 12/5
x = 8/5
∴x = 1.6
答:此方程的解为x = 8/5,【即等于x = 1.6】
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