因式分解的练习题
(1)4x(a-b)+(b2-a2);(2)(a2+b2)2-4a2b2;(3)x4+2x2-3;(4)(x+y)2-3(x+y)(5)x3-2x2-3x;(6)4a2-...
(1)4x(a-b)+(b2-a2);
(2)(a2+b2)2-4a2b2;
(3)x4+2x2-3;
(4)(x+y)2-3(x+y)
(5)x3-2x2-3x;
(6)4a2-b2+6a-3b;
上面字母后面的数字是几次方的意思 展开
(2)(a2+b2)2-4a2b2;
(3)x4+2x2-3;
(4)(x+y)2-3(x+y)
(5)x3-2x2-3x;
(6)4a2-b2+6a-3b;
上面字母后面的数字是几次方的意思 展开
2个回答
展开全部
(1)4x(a-b)+(b²-a²)
=4x(a-b)-(a-b)(a+b)
=(a-b)(4x-a-b)
(2)(a²+b²)²-4a²b²
=(a²+b²-2ab)(a²+b²+2ab)
=(a-b)²(a+b)²
(3)x^4+2x²-3
=x^4+2x²+1-4
=(x²+1)²-4
=(x²+1-2)(x²+1+2)
=(x²-1)(x²+3)
=(x+1)(x-1)(x²+3)
(4)(x+y)²-3(x+y)
=(x+y)(x+y-3)
(5)x³-2x²-3x
=x(x²-2x-3)
=x(x-3)(x+1)
(6)4a²-b²+6a-3b
=(4a²-b²)+6a-3b
=(2a-b)(2a+b)+3(2a-b)
=(2a-b)(2a+b+3)
=4x(a-b)-(a-b)(a+b)
=(a-b)(4x-a-b)
(2)(a²+b²)²-4a²b²
=(a²+b²-2ab)(a²+b²+2ab)
=(a-b)²(a+b)²
(3)x^4+2x²-3
=x^4+2x²+1-4
=(x²+1)²-4
=(x²+1-2)(x²+1+2)
=(x²-1)(x²+3)
=(x+1)(x-1)(x²+3)
(4)(x+y)²-3(x+y)
=(x+y)(x+y-3)
(5)x³-2x²-3x
=x(x²-2x-3)
=x(x-3)(x+1)
(6)4a²-b²+6a-3b
=(4a²-b²)+6a-3b
=(2a-b)(2a+b)+3(2a-b)
=(2a-b)(2a+b+3)
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