12Xx25%+(3200-12X)x20%=700 5X+45=7X+3 (580-x)+[600-(x+272)]=444 每1步运算都要说.
问题描述:
12Xx25%+(3200-12X)x20%=700 5X+45=7X+3 (580-x)+[600-(x+272)]=444 每1步运算都要说.
12Xx25%+(3200-12X)x20%=700
5X+45=7X+3
(580-x)+[600-(x+272)]=444
答
1.)12Xx25%+(3200-12X)x20%=700
3X+640-2.4X=700
0.6X=60
X=100
2.)5X+45=7X+3
2X=42
X=21
3.)(580-x)+[600-(x+272)]=444
580-x+872-x=444
1452-2x=444
2x=1008
x=504