(2x^2+5X-12)/(x+4)四道题用大除法解决
1.(2x^2+5X-12)/(x+4)2.(a^3-8b^3)/(a-2b)3.(3x^2-5xy-2y)^2/(x-2y)4.(9m^2-4n^2+3m-2n)/(3...
1.(2x^2+5X-12)/(x+4)
2.(a^3-8b^3)/(a-2b)
3.(3x^2-5xy-2y)^2/(x-2y)
4.(9m^2-4n^2+3m-2n)/(3m-2n) 展开
2.(a^3-8b^3)/(a-2b)
3.(3x^2-5xy-2y)^2/(x-2y)
4.(9m^2-4n^2+3m-2n)/(3m-2n) 展开
1个回答
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1.(2x的2次方+5x-12)÷(x+4)
=(2x-3)×(x+4)÷(x+4)
=2x-3
2.(a的3次方-8b的3次方)÷(a-2b)
=(a-2b)×(a的2次方+2ab+4b的2次方)÷(a-2b)
=a的2次方+2ab+4b的2次方
3.(3x的2次方-5xy-2y的2次方)÷(x-2y)
=(3x+y)×(x-2y)÷(x-2y)
=3x+y
4.(9m的2次方-4n的2次方+3m-2n)÷(3m-2n)
=[(3m+2n)×(3m-2n)+(3m-2n)]÷(3m-2n)
=(3m-2n)×(3m+2n+1)÷(3m-2n)
=3m+2n+1
=(2x-3)×(x+4)÷(x+4)
=2x-3
2.(a的3次方-8b的3次方)÷(a-2b)
=(a-2b)×(a的2次方+2ab+4b的2次方)÷(a-2b)
=a的2次方+2ab+4b的2次方
3.(3x的2次方-5xy-2y的2次方)÷(x-2y)
=(3x+y)×(x-2y)÷(x-2y)
=3x+y
4.(9m的2次方-4n的2次方+3m-2n)÷(3m-2n)
=[(3m+2n)×(3m-2n)+(3m-2n)]÷(3m-2n)
=(3m-2n)×(3m+2n+1)÷(3m-2n)
=3m+2n+1
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