题目内容
计算（x5+2x4+
x3）÷（
x）2．
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（x5+2x4+
x3）÷（
x）2，
=（x5+2x4+x3）÷
x2，
=x5÷
x2+2x4÷
x2+x3÷
x2，
=4x3+8x2+2x．
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=（x5+2x4+x3）÷
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=x5÷
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=4x3+8x2+2x．
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x3）÷（