1、1/2a^2b-5ac-(3a^2c-a^2b)+(3ac-4a^2c) 当a=-1 ,b=2,c=-2 (化简求值) 二、计算题 2、(6m^2+4m-3)-(2m^2-4m-1) 3、 (8xy-x^2+y^2)-3(-x^2+y^2+5xy) 4、 (1/4x-2/3x^2y)·(-12xy) 5.(m+3n)^2(m-3n)^2 6 .(2a-b+3c)^2
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![1、1/2a^2b-5ac-(3a^2c-a^2b)+(3ac-4a^2c) 当a=-1 ,b=2,c=-2 (化简求值) 二、计算题 2、(6m^2+4m-3)-(2m^2-4m-1) 3、 (8xy-x^2+y^2)-3(-x^2+y^2+5xy) 4、 (1/4x-2/3x^2y)·(-12xy) 5.(m+3n)^2(m-3n)^2 6 .(2a-b+3c)^2](/uploads/image/z/14436081-9-1.jpg?t=1%E3%80%811%2F2a%5E2b-5ac-%283a%5E2c-a%5E2b%29%2B%283ac-4a%5E2c%29+%E5%BD%93a%3D-1+%2Cb%3D2%2Cc%3D-2+%EF%BC%88%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%89+%E4%BA%8C%E3%80%81%E8%AE%A1%E7%AE%97%E9%A2%98+2%E3%80%81%EF%BC%886m%5E2%2B4m-3%EF%BC%89-%EF%BC%882m%5E2-4m-1%EF%BC%89+3%E3%80%81+%EF%BC%888xy-x%5E2%2By%5E2%EF%BC%89-3%EF%BC%88-x%5E2%2By%5E2%2B5xy%EF%BC%89+4%E3%80%81+%281%2F4x-2%2F3x%5E2y%29%C2%B7%28-12xy%29+5.%28m%2B3n%29%5E2%28m-3n%29%5E2+6+.%282a-b%2B3c%29%5E2)
1、1/2a^2b-5ac-(3a^2c-a^2b)+(3ac-4a^2c) 当a=-1 ,b=2,c=-2 (化简求值) 二、计算题 2、(6m^2+4m-3)-(2m^2-4m-1) 3、 (8xy-x^2+y^2)-3(-x^2+y^2+5xy) 4、 (1/4x-2/3x^2y)·(-12xy) 5.(m+3n)^2(m-3n)^2 6 .(2a-b+3c)^2
1、1/2a^2b-5ac-(3a^2c-a^2b)+(3ac-4a^2c) 当a=-1 ,b=2,c=-2 (化简求值) 二、计算题 2、(6m^2+4m-3)-(2m^2-4m-1) 3、 (8xy-x^2+y^2)-3(-x^2+y^2+5xy) 4、 (1/4x-2/3x^2y)·(-12xy) 5.(m+3n)^2(m-3n)^2 6 .(2a-b+3c)^2
1、1/2a^2b-5ac-(3a^2c-a^2b)+(3ac-4a^2c) 当a=-1 ,b=2,c=-2 (化简求值) 二、计算题 2、(6m^2+4m-3)-(2m^2-4m-1) 3、 (8xy-x^2+y^2)-3(-x^2+y^2+5xy) 4、 (1/4x-2/3x^2y)·(-12xy) 5.(m+3n)^2(m-3n)^2 6 .(2a-b+3c)^2
是有点多!1:1/2ab-5ac-(3ac-ab)+(3ac-4ac) =-1/2ab-2ac-7ac 代入a=-1 ,b=2,c=-2 =-1/2×(-1)×2-2×(-1)×(-2)-7×(-1)×(-2) =-1-4+14 =11 2:6m+4m-3-(2m-4m-1) =6m+4m-3-2m+4m+1 =4m+8m-2 3:(8xy-x+y)-3(-x+y+5xy) =8xy-x+y+3x-3y-15xy =2x-2y-7xy 4:(1/4x-2/3xy)×(-12xy) =(1/4x)×(-12xy)-(2/3xy)×(-12xy) =-3xy+8xy 5:(m+3n)(m-3n) =[(m+3n)(m-3n)] =(m-9n) 6:(2a-b+3c) =4a+b+9c-4ab+12ac-6bc