x+1.8=4.2 x+1.8-1.8=4.2-1.8 x=2.4 怎么检验
问题描述:
x+1.8=4.2 x+1.8-1.8=4.2-1.8 x=2.4 怎么检验
答
检验
将x=2.4代人左边,
x+1.8=2.4+1.8=4.2 =右边