因式分解 (1)y²-y(x+y)² (2)(x+y)²-16(x-y)² (3)(x+y)²
因式分解(1)y²-y(x+y)²(2)(x+y)²-16(x-y)²(3)(x+y)²-14(x+y)+49(4)16...
因式分解 (1)y²-y(x+y)² (2)(x+y)²-16(x-y)² (3)(x+y)²-14(x+y)+49 (4)16-(29+3b)² (5)x²-Xy+4/1y²
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1)y²-y(x+y)² =y[√y+(x+y)][√y-(x+y)]
=y(x+y+√)(√y-x-y)
2)(x+y)²-16(x-y)² =[(x+y)+4(x-y)][(x+y)-4(x-y)]
=(5x-3y)(5y-3x)
3)(x+y)²-14(x+y)+49
=[(x+y)+7 ]²
=(x+y+7)²
4)16-(29+3b)² =[4+(29+3b][4-(29+3b]
=-3(11+b)(25-3b)
5)x²-Xy+4/1y²=(x-1/2*y)²=(2x-y)²/4
=y(x+y+√)(√y-x-y)
2)(x+y)²-16(x-y)² =[(x+y)+4(x-y)][(x+y)-4(x-y)]
=(5x-3y)(5y-3x)
3)(x+y)²-14(x+y)+49
=[(x+y)+7 ]²
=(x+y+7)²
4)16-(29+3b)² =[4+(29+3b][4-(29+3b]
=-3(11+b)(25-3b)
5)x²-Xy+4/1y²=(x-1/2*y)²=(2x-y)²/4
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