计算:(-x2+5+4x)+(5x-4+2x2)
计算:(-x2+5+4x)+(5x-4+2x2)
数学人气:954 ℃时间:2020-09-12 10:11:15
优质解答
原式=-x2+5+4x+5x-4+2x2=x2+9x+1.
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