X+30%X=65 (1-30%)X=65 4X+3乘80%=8
问题描述:
X+30%X=65 (1-30%)X=65 4X+3乘80%=8
答
X+30%X=65
1.3X=65
X=65/1.3
X=50
(1-30%)X=65
0.7X=65
X=65/0.7
X=650/7
4X+3乘80%=8
4X+2.4=8
4X=8-2.4
4X=5.6
X=5.6/4
X=1.4比64的50%少7的数是125的几分之几??12个6分之5与12的6分之5的和,除以75与5分之4的积,商是多少??