(x-2500)[8+ (3500-x)]=(3500-2500)×8 ×(1+12.
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(x-2500)[8+ (3500-x)]=(3500-2500)×8 ×(1+12.
(x-2500)[8+ (3500-x)]=(3500-2500)×8 ×(1+12.
(x-2500)[8+ (3500-x)]=(3500-2500)×8 ×(1+12.
先把等号右边算出来,然后把左边式子展开,解二次方程即可