去括号练习题化简:-(x-6y)-(-7+3y)3(2a^2-b^2)-2(3b^2-2a^2)(m^2-2mn+n^2)-(m^2+2mn+n^2)-1/2(x+y)-1/4(x-y)-3/4(x^2-x)+2(x^2-x)还有化简求值,2(x-3x^2+1)-3(2x^2-x-2)其中x=2
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 21:48:32
![去括号练习题化简:-(x-6y)-(-7+3y)3(2a^2-b^2)-2(3b^2-2a^2)(m^2-2mn+n^2)-(m^2+2mn+n^2)-1/2(x+y)-1/4(x-y)-3/4(x^2-x)+2(x^2-x)还有化简求值,2(x-3x^2+1)-3(2x^2-x-2)其中x=2](/uploads/image/z/336112-16-2.jpg?t=%E5%8E%BB%E6%8B%AC%E5%8F%B7%E7%BB%83%E4%B9%A0%E9%A2%98%E5%8C%96%E7%AE%80%3A-%28x-6y%29-%28-7%2B3y%293%282a%5E2-b%5E2%29-2%283b%5E2-2a%5E2%29%28m%5E2-2mn%2Bn%5E2%29-%28m%5E2%2B2mn%2Bn%5E2%29-1%2F2%28x%2By%29-1%2F4%28x-y%29-3%2F4%28x%5E2-x%29%2B2%28x%5E2-x%29%E8%BF%98%E6%9C%89%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%2C2%EF%BC%88x%EF%BC%8D3x%5E2%EF%BC%8B1%EF%BC%89%EF%BC%8D3%EF%BC%882x%5E2%EF%BC%8Dx%EF%BC%8D2%EF%BC%89%E5%85%B6%E4%B8%ADx%EF%BC%9D2)
去括号练习题化简:-(x-6y)-(-7+3y)3(2a^2-b^2)-2(3b^2-2a^2)(m^2-2mn+n^2)-(m^2+2mn+n^2)-1/2(x+y)-1/4(x-y)-3/4(x^2-x)+2(x^2-x)还有化简求值,2(x-3x^2+1)-3(2x^2-x-2)其中x=2
去括号练习题
化简:
-(x-6y)-(-7+3y)
3(2a^2-b^2)-2(3b^2-2a^2)
(m^2-2mn+n^2)-(m^2+2mn+n^2)
-1/2(x+y)-1/4(x-y)
-3/4(x^2-x)+2(x^2-x)
还有化简求值,2(x-3x^2+1)-3(2x^2-x-2)其中x=2
去括号练习题化简:-(x-6y)-(-7+3y)3(2a^2-b^2)-2(3b^2-2a^2)(m^2-2mn+n^2)-(m^2+2mn+n^2)-1/2(x+y)-1/4(x-y)-3/4(x^2-x)+2(x^2-x)还有化简求值,2(x-3x^2+1)-3(2x^2-x-2)其中x=2
-(x-6y)-(-7+3y)
=-x+6y+7-3y
=-x+3y+7
3(2a²-b²)-2(3b²-2a²)
=6a²-3b²-6b²+4a²
=10a²-9b²
(m²-2mn+n²)-(m²+2mn+n²)
=m²-2mn+n²-m²-2mn-n²
=-4mn
-1/2(x+y)-1/4(x-y)
=-x/2-y/2-x/4+y/4
=-3x/4-y/4
-3/4(x²-x)+2(x²-x)
=(-3/4+2)(x²-x)
=5/4(x²-x)
=5x²/4-5x²/4
2(x-3x²+1)-3(2x²-x-2)
=2x-6x²+2-6x²+3x+6
=-12x²+x+8
=-12×2²+2²+8
=-36