9x一1.2÷2=7.5
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解:解方程, 此方程的解为x = 9/10,【即x = 0.9】
9x - 1.2 ÷ 2 = 7.5
9x - (1×10+2)/10 × 1/2 = (7×10+5)/10
9x - 12/10 × 1/2 = 75/10
9x - 6/5 × 1/2 = 15/2
9x - 3/5 = 15/2
9x = 15/2 + 3/5
9x = 75/10 + 6/10
9x = 81/10
x = 81/10 ÷ 9
x = 81/10 × 1/9
x = 9/10
∴x = 0.9
答:此方程的解为x = 9/10,【即x = 0.9】
9x - 1.2 ÷ 2 = 7.5
9x - (1×10+2)/10 × 1/2 = (7×10+5)/10
9x - 12/10 × 1/2 = 75/10
9x - 6/5 × 1/2 = 15/2
9x - 3/5 = 15/2
9x = 15/2 + 3/5
9x = 75/10 + 6/10
9x = 81/10
x = 81/10 ÷ 9
x = 81/10 × 1/9
x = 9/10
∴x = 0.9
答:此方程的解为x = 9/10,【即x = 0.9】
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