(10-8+x)(200-x除以0.5乘10)=640怎么解
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(10-8+x)(200-x除以0.5乘10)=640怎么解
(10-8+x)(200-x除以0.5乘10)=640怎么解
(10-8+x)(200-x除以0.5乘10)=640怎么解
(10-8+X)×(200-X÷0.5×10)=640
(2+X)×(200-20X)=640
-20X+160X-240=640
X-8X+12=0
(X-4)=-12+4
X-4=±2
X=±2+4