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140x0.5坚式怎么列

140x0.5竖式

140乘0.43 括号x-140括回乘0.43等于0.5x 140*0.43(X-140)*0.4

(1)7-2x=3-4x,∴4x-2x=3-7,∴x=-2;(2)18=140-x2,∴5=1-20

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