计算:①-5+(+3)-(-7)-(+1)②?24×(12+23?56)③-12011+4×(-3)2+(-6)÷(-2)④13(9ab2-3)+
计算:①-5+(+3)-(-7)-(+1)②?24×(12+23?56)③-12011+4×(-3)2+(-6)÷(-2)④13(9ab2-3)+(7a2b-2)+2(a...
计算:①-5+(+3)-(-7)-(+1)②?24×(12+23?56)③-12011+4×(-3)2+(-6)÷(-2)④13(9ab2-3)+(7a2b-2)+2(ab2+1)-2a2b.
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