(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3)其中x=五分之四,明天要交作业

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(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3)其中x=五分之四,明天要交作业
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(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3)其中x=五分之四,明天要交作业
(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3)其中x=五分之四,明天要交作业

(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3)其中x=五分之四,明天要交作业
(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3)
=x²+x-6+3x²-3-4x²-4x+3
=-3x-6
=-3*(4/5)-6
=-3.8-6
=-9.8

(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3)
=x²+x-6+3x²-3-4x²+4x+3
=5x-6
=5×4/5-6
= -2

(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3)
=x²+x-6+3(x²-1)-(4x²-4x-3)
=x²+x-6+3x²-3-4x²+4x+3
=5x-6
=5*(4/5)-6
=4-6
=-2