1/2(A+ B)-1/3(A-B)
=1/2A+1/2B-1/3A+1/3B
=1/6A+5/6B
=1/6*(-1/2x+3x²-x³)+5/6*(2x³+2x²-x-2)
=-1/12x+x²/2-x³/6+5/3x³+5x²/3-5/6x-5/3
=3/2x³+13/6x²-11/12x-5/3
不知道你的题目是不是这样的.
A=-1/2x 3x2-x3,B=2(x3 x2-1/2x-1),求1/2(A B)-1/3(A-B)的值
2个回答
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