(6-x)(8-x)/2=6*8/2/2
1个回答
1/2(8-x)(6-x)=1/2*1/2*8*6
(8-x)(6-x)=24
48-14x+x²=24
x²-14x+24=0
(x-2)(x-12)=0
x=2.x=12
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