X-30%X-[(X-30%X)×20%-2]-30%X=28怎么解
问题描述:
X-30%X-[(X-30%X)×20%-2]-30%X=28怎么解
答
X-30%X-[(X-30%X)×20%-2]-30%X=28
X-0.3X-(0.7X×0.2-2)-0.3X=28
0.7X-0.14X+2-0.3X=28
0.7X-0.14X-0.3X=28-2
0.26X=26
X=26÷0.26
X=100