计算:1)(3a²-2a+1)-(2a²+3a-5) 2)-二分之三x×(三分之二x²-2x+4)
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计算:1)(3a²-2a+1)-(2a²+3a-5) 2)-二分之三x×(三分之二x²-2x+4)
计算:1)(3a²-2a+1)-(2a²+3a-5) 2)-二分之三x×(三分之二x²-2x+4)
计算:1)(3a²-2a+1)-(2a²+3a-5) 2)-二分之三x×(三分之二x²-2x+4)
1)(3a^2-2a+1)-(2a^2+3a-5)
=3a^2-2a+1-2a^2-3a+5
=a^2-5a+6
2) -3/2x×(2/3x^2-2x+4)
=-x^3+3x^2-6x
(注:几/几=几分之几)