(580-x)+[600-(x+272)]=444

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(580-x)+[600-(x+272)]=444
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(580-x)+[600-(x+272)]=444
(580-x)+[600-(x+272)]=444

(580-x)+[600-(x+272)]=444
X=232

(580-x)+[600-(x+272)]=444 x+x+272=580+600-444 解方程 5X+45=7X+3 12Xx25％+（3200-12X）x20％=700 (580-x)+[600-(x+272)]=444 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 x x X x x x x x x x x |x| X x