问题 解答题 求未知数x.①0.251.25=1.6x ②2x-1.65+2.35=7. 答案 ①0.251.25=1.6x0.25x=1.25×1.6x=8; ②2x-1.65+2.35=72x=7+1.65-2.352x=6.3x=3.15.