1.a-(2a+b)+(3a-4b)=_____________.2.多项式____与m²+m-2的和是m²-2m

问题描述:

1.a-(2a+b)+(3a-4b)=_____________.2.多项式____与m²+m-2的和是m²-2m
3.4x2-[6x-(2x-3)+2x2]=_____________. 4.(8x²y-xy²)-4(x²y-4分之1xy²)_____________
7.化简n-mn-3(-m-n)-(-m)-11
填空
m2-2n2减去5m2-3n2+1的差为________.

1.2a-5b
2.2-3m
3.2x²-4x-3
4.4x²y
7.4m+4n-mn-11
n²-4m²-1-2(a²-3a)+(5a²-2a)3a²+4a