x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y

spunme2022-10-04 11:39:541条回答

x^2+3y-3x
x^3+2x^2y-9x-18y
(y+2)x^2+(y+2)x-12y-24
m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2
x^2+3y-xy-3x

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男儿响当当 共回答了18个问题 | 采纳率77.8%
第一个不会,你没抄错题?
第二个是(x+2y)(x+3)(x-3);
第三个是(x+4)(x-3)(y+2);
第四个是(x+y)(x-y)(m+n)(m-n).
1年前

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分解因式:①x^2+3y-xy-3x②x^3+2x^2y-9x-18y③(y+2)x^2+(y+2)x-12y-24
分解因式:①x^2+3y-xy-3x②x^3+2x^2y-9x-18y③(y+2)x^2+(y+2)x-12y-24
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①x^2+3y-xy-3x
=x(x-y)-3(x-y)
=(x-y)(x-3)
②x^3+2x^2y-9x-18y
=x²(x+2y)-9(x+2y)
=(x+2y)(x²-9)
=(x+2y)(x-3)(x+3)
③(y+2)x^2+(y+2)x-12y-24
=(y+2)x²+(y+2)x-12(y+2)
=(y+2)(x²+x-12)
=(y+2)(x+4)(x-3)
④m平方x平方+n平方y平方-n平方x平方
=x²(m²-n²)+n²y²
=x²(m-n)(m+n)+n²y²
分组分解法.1.x^2+3y-xy-3x2.(y+2)x^2+(y+2)x-12y-243.m^2x^2+n^2y^2-
分组分解法.
1.x^2+3y-xy-3x
2.(y+2)x^2+(y+2)x-12y-24
3.m^2x^2+n^2y^2-m^2y^2-n^2x^2
4.x^2-4y^2-x-2y
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1)X²+3Y-XY-3X
=X²-XY-(3X-3Y)
=X(X-Y)-3(X-Y)
=(X-Y)(X-3)
2)(Y+2)X²+(Y+2)X-12Y-24
=(Y+2)X²+(Y+2)X-12(Y+2)
=(Y+2)(X²+X-12)
=(Y+2)(X-3)(X+4)
3)m²X²+n²Y²-m²Y²-n²X²
=m²(X²-Y²)-n²(X²-Y²)
=(m²-n²)(X²-Y²)
=(m-n)(m+n)(X-Y)(X+Y)
4) X²-4Y²-X-2Y
=(X-2Y)(X+2Y)-(X+2Y)
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