80×3.5²+160×3.5×1.5+80×1.5²
=80×(3.5²+2×3.5×1.5+1.5²)
=80×(3.5+1.5)²
=80×5²
=400×5
=2000
因式分解:80×3.5²+160×3.5×1.5+80×1.5²
因式分解:80×3.5²+160×3.5×1.5+80×1.5²
数学人气:413 ℃时间:2020-04-03 09:00:18
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