1、(-2x)·(3x-1)-(x-1)^22、(x-y+1)^3·(y-x-1)^2·(x-y+1)^n+13、(-2)^3÷2^5÷(-1/2)^2+(-2)^24、(x-2y)(x+2y)-(x-2y)^2
1、(-2x)·(3x-1)-(x-1)^22、(x-y+1)^3·(y-x-1)^2·(x-y+1)^n+13、(-2)^3÷2^5÷(-1/2)^2+(-2)^24、(x-2y)(x+2y)-(x-2y)^2
1、(-2x)·(3x-1)-(x-1)^2
2、(x-y+1)^3·(y-x-1)^2·(x-y+1)^n+1
3、(-2)^3÷2^5÷(-1/2)^2+(-2)^2
4、(x-2y)(x+2y)-(x-2y)^2
1、(-2x)·(3x-1)-(x-1)^22、(x-y+1)^3·(y-x-1)^2·(x-y+1)^n+13、(-2)^3÷2^5÷(-1/2)^2+(-2)^24、(x-2y)(x+2y)-(x-2y)^2
1、
原式=-6x²+2x-x²+2x-1
=-7x²+4x-1
这个不能分解
2、
原式=(x-y+1)³*(x-y+1)²(x-y+1)^(n+1)
=(x-y+1)^(3+2+n+1)
=(x-y+1)^(n+6)
3、
原式=-2^3÷2^5÷2^(-1)+4
=-2^(3-5+1)+4
=-1/2+4
=7/2
4、
原式=(x-2y)(x+2y-x+2y)
=4y(x-2y)
1、(-2x)·(3x-1)-(x-1)^2=-6x^2+2x-x^2+2x-1=-7x^2+4x-1
﹙1﹚原式=﹣6x²+2x-x²+2x-1=﹣7x²+4x-1;
﹙2﹚原式=﹙x-y+1﹚³·﹙x-y+1﹚²·﹙x-y+1﹚^﹙n+1﹚
=﹙x-y+1﹚^﹙n+6﹚
﹙3﹚原式=﹣2³÷2^5÷2^﹙﹣2﹚+2²
=﹣...
全部展开
﹙1﹚原式=﹣6x²+2x-x²+2x-1=﹣7x²+4x-1;
﹙2﹚原式=﹙x-y+1﹚³·﹙x-y+1﹚²·﹙x-y+1﹚^﹙n+1﹚
=﹙x-y+1﹚^﹙n+6﹚
﹙3﹚原式=﹣2³÷2^5÷2^﹙﹣2﹚+2²
=﹣2^﹙﹣2﹚÷2^﹙﹣2﹚+4
=﹣1+4
=3
﹙4﹚原式=﹙x-2y﹚﹙x+2y-x+2y﹚
=﹙x-2y﹚×4y
=4xy-8y²
收起
1、(5x-1)*(x+1)
2、n=1时,原式=(x-y+1)^3
n=2时,原式=-(y-x+1)^2
n>2时,原式=(x-y+1)[x-y+(x-y+1)^(n-1)]
3、4
4、4y(x-2y)
1、原式=-6x^2+2x-x^2+2x-1=-7x^2+4x-1
2、原式=(x-y+1)^n+3·(y-x-1)^2·
3、原式=(-2)^3÷2^5÷(-2)^-2+(-2)^2=(-2)^3÷(-2)^-2
÷2^5+(-2)^2=1+4=5
4、原式=(x-2y)[(x+2y)-(x-2y)]=4y(x-2y)