1.a-(2a+b)+(3a-4b)=_____________.2.多项式____与m²+m-2的和是m²-2m3.4x2-[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

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