2x+5(100-x)=320,怎么解,
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2x+5(100-x)=320,怎么解,
2x+5(100-x)=320,怎么解,
2x+5(100-x)=320,怎么解,
2x+5(100-x)=320
2x+500-5x=320
2x-5x=320-500
-3x=-180
x=60
2x+5(100-x)=320
2x+500-5x=320 括号展开
500-320=5x-2x 移项
180=3x
x=60
2x+500-5x=320
-3x=-180
x=60
2x+5(100-x)=320 2x+500-5x=320 -3x=-180 x =60
OK了~~