12道十字相乘因式分解题1.x²-xy-2y²2.x²+6xy+8y²3.2x²-xy-y²4.4x²-xy-5y²5.abcx²+(a²b²+c²)x+abc6.mnx²-(m²+n²)xy+mny²7.(x²-2) ²-(x²-2)-28.(x²+4x)
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![12道十字相乘因式分解题1.x²-xy-2y²2.x²+6xy+8y²3.2x²-xy-y²4.4x²-xy-5y²5.abcx²+(a²b²+c²)x+abc6.mnx²-(m²+n²)xy+mny²7.(x²-2) ²-(x²-2)-28.(x²+4x)](/uploads/image/z/3713796-36-6.jpg?t=12%E9%81%93%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E9%A2%981.x%26%23178%3B-xy-2y%26%23178%3B2.x%26%23178%3B%2B6xy%2B8y%26%23178%3B3.2x%26%23178%3B-xy-y%26%23178%3B4.4x%26%23178%3B-xy-5y%26%23178%3B5.abcx%26%23178%3B%2B%28a%26%23178%3Bb%26%23178%3B%2Bc%26%23178%3B%29x%2Babc6.mnx%26%23178%3B-%28m%26%23178%3B%2Bn%26%23178%3B%29xy%2Bmny%26%23178%3B7.%28x%26%23178%3B-2%29+%26%23178%3B-%28x%26%23178%3B-2%29-28.%28x%26%23178%3B%2B4x%29)
12道十字相乘因式分解题1.x²-xy-2y²2.x²+6xy+8y²3.2x²-xy-y²4.4x²-xy-5y²5.abcx²+(a²b²+c²)x+abc6.mnx²-(m²+n²)xy+mny²7.(x²-2) ²-(x²-2)-28.(x²+4x)
12道十字相乘因式分解题
1.x²-xy-2y²
2.x²+6xy+8y²
3.2x²-xy-y²
4.4x²-xy-5y²
5.abcx²+(a²b²+c²)x+abc
6.mnx²-(m²+n²)xy+mny²
7.(x²-2) ²-(x²-2)-2
8.(x²+4x) ²-x²-4x-20
9.(x+y)(x+y+2xy)+x²y²-1
10.x²-3xy-10y²+x+9y-2
11.a²+ab-6b²+5a+35b-36
12.x³-3x²+4
15分钟内答,谁能在后面给我把什么是双十字相乘法讲清楚,最高共能得80分.不想要只有答案的那种,如果我发现回答的非常详细,
12道十字相乘因式分解题1.x²-xy-2y²2.x²+6xy+8y²3.2x²-xy-y²4.4x²-xy-5y²5.abcx²+(a²b²+c²)x+abc6.mnx²-(m²+n²)xy+mny²7.(x²-2) ²-(x²-2)-28.(x²+4x)
1.x²-xy-2y²=(x+y)(x-2y)
2.x²+6xy+8y²=(x+2y)(x+4y)
3.2x²-xy-y²=(2x+y)(x-y)
4.4x²-xy-5y²=(4x-5y)(x+y)
5.abcx²+(a²b²+c²)x+abc=(abx+c)(cx+ab)
6.mnx²-(m²+n²)xy+mny²=(mx-ny)(nx-my)
7.(x²-2) ²-(x²-2)-2=[(x²-2)+1][(x²-2)-2]=(x²-1)(x²-4)=(x+1)(x-1)(x+2)(x-2)
8.(x²+4x) ²-x²-4x-20=(x²+4x)²-(x²+4x)-20=[(x²+4x)+4][(x²+4x)-5]=(x+2)²(x-1)(x+5)
9.(x+y)(x+y+2xy)+x²y²-1=(x+y)²+2xy(x+y)+(xy)²-1=(x+y+xy)²-1=(x+y+xy+1)(x+y+xy-1)
=(x+1)(y+1)(x+y+xy-1)
10.x²-3xy-10y²+x+9y-2=(x²-3xy-10y²)+x+9y-2=(x+2y)(x-5y)+2(x+2y)-(x-5y)-2
=(x+2y-1)(x-5y+2)
11.a²+ab-6b²+5a+35b-36=(a²+ab-6b²)+5a+35b-36=(a-2b)(a+3b)-4(a-2b)+9(a+3b)-36
=(a-2b+9)(a+3b-4)
12.x³-3x²+4=(x³+x²)-(4x²-4)=x²(x+1)-4(x+1)(x-1)=(x+1)(x²-4x+4)=(x+1)(x-2)²
现在答 行不行