计算题:
求(x+1)(x+2)-2(x+3)(x-1),(x+y)^2(x-y)^2,(3m+4n)(3m-4n)(9m^2+16n^2),4(a-b)^2-(2a+b)(-b+...
求(x+1)(x+2)-2(x+3)(x-1),(x+y)^2(x-y)^2,(3m+4n)(3m-4n)(9m^2+16n^2),4(a-b)^2-(2a+b)(-b+2a),(1+x-y)(x+y-1),999^2-1002×998,2(y-4)(3y+2)+5(-3y+7)(y+1)的值,尽量多答一些!!!
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2个回答
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1、x²+3x+2-2x²-4x+6=-x²-x+8
2、不用化简了=(x+y)²(x-y)²
3、=(9m²-16n²)(9m²+16n²)=81m^4-256n^4
4、=4(a²+b²-2ab)-4a²+b²=5b²-8ab
5、=[x+(1-y)][x-(1-y)]=x²-(1-y)²
6、=(1000-1)²-(1000+2)(1000-2)=1000000+1-2000-1000000+4=-1995
7、=6y²-20y-16-15y²+20y+40=-9y²+24.
2、不用化简了=(x+y)²(x-y)²
3、=(9m²-16n²)(9m²+16n²)=81m^4-256n^4
4、=4(a²+b²-2ab)-4a²+b²=5b²-8ab
5、=[x+(1-y)][x-(1-y)]=x²-(1-y)²
6、=(1000-1)²-(1000+2)(1000-2)=1000000+1-2000-1000000+4=-1995
7、=6y²-20y-16-15y²+20y+40=-9y²+24.
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