计算 -3(2x²-xy)+4(x²+xy-6);-8m²-【4m-2m²-(-3m-m²-7)-8】我要做作业,

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计算 -3(2x²-xy)+4(x²+xy-6);-8m²-【4m-2m²-(-3m-m²-7)-8】我要做作业,

计算 -3(2x²-xy)+4(x²+xy-6);-8m²-【4m-2m²-(-3m-m²-7)-8】我要做作业,
计算 -3(2x²-xy)+4(x²+xy-6);-8m²-【4m-2m²-(-3m-m²-7)-8】
我要做作业,

计算 -3(2x²-xy)+4(x²+xy-6);-8m²-【4m-2m²-(-3m-m²-7)-8】我要做作业,
-3(2x²-xy)+4(x²+xy-6)
=-6x^2+3xy+4x^2+4xy-24
=-2x^2+7xy-24
;-8m²-【4m-2m²-(-3m-m²-7)-8】
=-8m^2-4m+2m^2-3m-m^2-7+8
=-7m^2-7m+1