化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a 1.计算 (1)化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a^2-2ab-b^2)-b(ab+2
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![化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a 1.计算 (1)化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a^2-2ab-b^2)-b(ab+2](/uploads/image/z/1857452-68-2.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC+%EF%BC%881%EF%BC%89%EF%BC%88x-2%EF%BC%89%EF%BC%88x%2B3%EF%BC%89%2B3%EF%BC%88x-1%EF%BC%89%EF%BC%88x%2B1%EF%BC%89-%EF%BC%882x%2B1%EF%BC%89%EF%BC%882x-3%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D5%E5%88%86%E4%B9%8B4+%EF%BC%882%29+-a%28a+1.%E8%AE%A1%E7%AE%97+%EF%BC%881%EF%BC%89%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC+%EF%BC%881%EF%BC%89%EF%BC%88x-2%EF%BC%89%EF%BC%88x%2B3%EF%BC%89%2B3%EF%BC%88x-1%EF%BC%89%EF%BC%88x%2B1%EF%BC%89-%EF%BC%882x%2B1%EF%BC%89%EF%BC%882x-3%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D5%E5%88%86%E4%B9%8B4+%EF%BC%882%29++-a%28a%5E2-2ab-b%5E2%29-b%28ab%2B2)
化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a 1.计算 (1)化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a^2-2ab-b^2)-b(ab+2
化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a 1.计算 (1)
化简求值
(1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4
(2) -a(a^2-2ab-b^2)-b(ab+2a^2-b^2), a=2, b= 2分之1
化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a 1.计算 (1)化简求值 (1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4 (2) -a(a^2-2ab-b^2)-b(ab+2
化简求值
(1)(x-2)(x+3)+3(x-1)(x+1)-(2x+1)(2x-3),其中x=5分之4
=x^2+3x-2x-6+3x^2-3-4x^2+6x-2x+3
=5x-6
=5*(4/5)-6
=4-6
=-2
(2) -a(a^2-2ab-b^2)-b(ab+2a^2-b^2),a=2,b= 2分之1
= -a^3+2a^2b+ab^2-ab^2-2a^2b+b^3
= -a^3+b^3
=-2^3+(1/2)^3
=-8+1/8
=-7又7/8
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