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[ 數學 ](急!)因式分解: -點計[ 數學 ](急!)因

發問:

(x/4)^2+(32-x/4)^2=40 x=?????????????? (x/4)^2+(32-x/4)^2=40 (x/4)^2+(32-x/4)^2=40 (x/4)^2+(32-x/4)^2=40 (x/4)^2+(32-x/4)^2=40 (x/4)^2+(32-x/4)^2=40 (x/4)^2+(32-x/4)^2=40 (x/4)^2+(32-x/4)^2=40

最佳解答:

(x/4)^2+[(32-x)/4]^2=40 Sol (x/4)^2+[(32-x)/4]^2=40 16(x/4)^2+16[(32-x)/4]^2=16*40 x^2+(32-x)^2=640 x^2+x^2-64x+1024=640 2x^2-64x+384=0 x^2-32x+192=0 (x-8)(x-24)=0 x=8 or x=24

其他解答:

(x/4)^2+(32-x/4)^2=40 x^2/16+(32-x/4)(32-x/4)=40 x^2/16+32^2-16x-x^2/16=40 1024-16x=40 x=61.5

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