化简(1) 2(x-8)(x+5)-(2x-1)(x+2) (2) (3m+1)(2m-3)-(6m-5)(m-4)
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化简(1) 2(x-8)(x+5)-(2x-1)(x+2) (2) (3m+1)(2m-3)-(6m-5)(m-4)
化简
(1) 2(x-8)(x+5)-(2x-1)(x+2)
(2) (3m+1)(2m-3)-(6m-5)(m-4)
化简(1) 2(x-8)(x+5)-(2x-1)(x+2) (2) (3m+1)(2m-3)-(6m-5)(m-4)
=2x^2-6x-80-2x^2-3x+2
=-9x-78
=6m^2-7m-3-6m^2+29m+20
=22m+17
2(x-8)(x+5)-(2x-1)(x+2)=2x^2-6x-80-2x^2-3x+2
=-9x-78
(3m+1)(2m-3)-(6m-5)(m-4)=6m^2-7m-3-6m^2+29m-20
=22m-23
1.2(x的平方-3x-40)-(2x的平方+3x-2)
=(2x^2-6x-80)-(2x^2+3x-2)
=2x^2-6x-80-2x^2-3x+2
=-9x-78
2.(6m^2-7m-3)-(6m^2-29m+20)
=6m^2-7m-3-6m^2+29m-20
=22m-23
2(x-8)(x+5)-(2x-1)(x+2)=2x^2-6x-80-2x^2-3x+2
=-9x-78
(3m+1)(2m-3)-(6m-5)(m-4)=6m^2-7m-3-6m^2+29m-20
=22m-23
2(=6m^2-7m-3-6m^2+29m+20 x-8)(x+5)-(2x-1)(x+2)=2x^2-6x-80-2x^2-3x+2 =-9x-78
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