话简并求值:(a^b-ab)-2(ab^-ba),其中a=-1/2.b=21-(3a-1)-a^其中a=99
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话简并求值:(a^b-ab)-2(ab^-ba),其中a=-1/2.b=21-(3a-1)-a^其中a=99
话简并求值:(a^b-ab)-2(ab^-ba),其中a=-1/2.b=2
1-(3a-1)-a^其中a=99
话简并求值:(a^b-ab)-2(ab^-ba),其中a=-1/2.b=21-(3a-1)-a^其中a=99
(a^b-ab)-2(ab^-ba),其中a=-1/2.b=2
=a^2b-ab-2ab^2+2ab
=a^2b+ab-2ab^2
=(-1/2)^2*2+(-1/2)*2-2*(-1/2)*2^2
=-1/2-1+4
=5/2
1-(3a-1)-a^其中a=99
1-(3a-1)-a^2
=1-3a+1-a^2
=-3a-a^2
=-3*99-99^2
=-102*99
=-10098
6(1/2X^2+2/3X+2)
=3x^2+4x+12