3.15x÷7=13要怎么解?
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解:解方程,此方程的解为x = 260/9
3.15x ÷ 7 = 13
[(3×100+15)/100]x = 13 × 7
(315/100)x = 91
(63/20)x = 91
x = 91 ÷ 63/20
x = 91 × 20/63
x = (13×7)/1 × 20/(9×7)
x = (13×20)/9
∴x = 260/9
答:此方程的解为x = 260/9
3.15x ÷ 7 = 13
[(3×100+15)/100]x = 13 × 7
(315/100)x = 91
(63/20)x = 91
x = 91 ÷ 63/20
x = 91 × 20/63
x = (13×7)/1 × 20/(9×7)
x = (13×20)/9
∴x = 260/9
答:此方程的解为x = 260/9
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