40%+40%(x-30)+120=x 怎么解
问题描述:
40%+40%(x-30)+120=x 怎么解
答
0.4+0.4X-12+120=x 120.4-12=0.6x 108.4=0.6X x=
40%+40%(x-30)+120=x 怎么解
0.4+0.4X-12+120=x 120.4-12=0.6x 108.4=0.6X x=