化简求值 ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1,a=1,b=-1

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化简求值 ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1,a=1,b=-1

化简求值 ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1,a=1,b=-1
化简求值 ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1,a=1,b=-1

化简求值 ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1,a=1,b=-1
ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1
=ab^3+3ab^3+1
=4ab^3+1
=4(1)(-1)^3+1
=4(1)(-1)+1
=-4+1
=-3

ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1
=(ab^3+3ab^3)+(-2ab+2ab)+(a^2b^3-a^2b^3)+(-1+2)
=4ab^3+1
=4×1×(-1)^3+1
=-3