-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^
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![-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^](/uploads/image/z/3736860-60-0.jpg?t=-4x%5E2y-8xy%5E2%2B2x%5E2y-3xy%5E2+%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9-4x%5E2y-8xy%5E2%2B2x%5E2y-3xy%5E2+3x%5E2-1-2x-5%2B3x-x%5E2+-0.8a%5E2b-6ab-1.2a%5Eb%2B5ab%2Ba%5E2b+5yx-3x%5E2y-7xy%5E2%2B6xy-12xy%2B7xy%5E2%2B8x%5E2y+%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9+%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F1%2F2%28a-b%29%5E2%2B1%2F4%28a%2Bb%29-1%2F3%28a-b%29%5E2-1%2F5%28a%2Bb%29%E7%9A%84%E5%80%BC%2C%E5%85%B6%E4%B8%ADa%3D-1+b%3D1%2F2.+%E5%A6%82%E6%9E%9Cx%5E)
-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^
-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项
-4x^2y-8xy^2+2x^2y-3xy^2
3x^2-1-2x-5+3x-x^2
-0.8a^2b-6ab-1.2a^b+5ab+a^2b
5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y
合并同类项
求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2.
如果x^2+my-12与多项式nx^2-3y+6 的和中不含有x、y,试求mn的值
-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^
-4x^2y-8xy^2+2x^2y-3xy^2
=-2x²y-11xy²
=-xy(2x+11y)
3x^2-1-2x-5+3x-x^2
=2x²+x-6
=(2x-3)(x+2)
-0.8a^2b-6ab-1.2a^b+5ab+a^2b
=-a²b-ab
=-ab(a+1)
5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y
=-xy+5x²y
=xy(5x-1)
求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2.
代数式=1/6(a-b)²+1/20(a+b)=1/6(-1-1/2)²+1/20(-1+1/2)=3/8-1/40=7/20
如果x^2+my-12与多项式nx^2-3y+6 的和中不含有x、y,试求mn的值
x²+my-12+nx²-3y+6=(n+1)x²+(m-3)y-6
根据题意
n+1=0
n=-1
m-3=0
m=3
nm=-3