4(世搭丛搜樱a^2-3ab)枝升-3(-4ab+b^2)=4a^2-12ab+12ab-3b^2=4a^2-3b^25x+(-2x)-[3(2x-1)-4(2x+1)]=5x-2x-)-3(2x-1)+4(2x+1)=3x-6x+3+8x+4=5x+7
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(1)4a^2-12ab+12ab-3b^2=4a^2-3b^2(2)5x-2x-6x+3+8x+4=5x+7