解:解方程,此方程的解为x = 9/5,【即x = 1.8】 x ÷ 0.8 = 2.25 x ÷ 8/10 = (2×100+25)/100 x ÷ 4/5 = 225/100 x ÷ 4/5 = 9/4 x = 9/4 × 4/5 x = 9/5 ∴x = 1.8 答:此方程的解为x = 9/5,【即x = 1.8】
x÷0.8=2.25x=0.8x2.25x=1.8