20-9X=1.2X6.25解方程?
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解:解方程, 此方程的解为x = 25/18
20 - 9x = 1.2 × 6.25
20 - 9x = (1×10+2)/10 × (6×100+25)/100
20 - 9x = 12/10 × 625/100
20 - 9x = 6/5 × 25/4
20 - 9x = 15/2
9x = 20 - 15/2
9x = 40/2 - 15/2
9x = 25/2
x = 25/2 ÷ 9
x = 25/2 × 1/9
∴x = 25/18
答:此方程的解为x = 25/18
20 - 9x = 1.2 × 6.25
20 - 9x = (1×10+2)/10 × (6×100+25)/100
20 - 9x = 12/10 × 625/100
20 - 9x = 6/5 × 25/4
20 - 9x = 15/2
9x = 20 - 15/2
9x = 40/2 - 15/2
9x = 25/2
x = 25/2 ÷ 9
x = 25/2 × 1/9
∴x = 25/18
答:此方程的解为x = 25/18
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