数学题(3mn-5m²)-﹙3m²-5mn)怎么做
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![数学题(3mn-5m²)-﹙3m²-5mn)怎么做](/uploads/image/z/2118675-3-5.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%883mn%EF%BC%8D5m%26%23178%3B%EF%BC%89%EF%BC%8D%EF%B9%993m%26%23178%3B%EF%BC%8D5mn%EF%BC%89%E6%80%8E%E4%B9%88%E5%81%9A)
数学题(3mn-5m²)-﹙3m²-5mn)怎么做
数学题(3mn-5m²)-﹙3m²-5mn)怎么做
数学题(3mn-5m²)-﹙3m²-5mn)怎么做
(3mn-5m²)-﹙3m²-5mn)
=3mn-5m^2-3m^2+5mn
=8mn-8m^2
(3mn-5m²)-﹙3m²-5mn)
=3mn-5m²-3m²+5mn
=8mn-8m²
=3mn-5m²—3m²+5mn
=8mn—8m²
你想干嘛,因式分解吗?
=8m(n-m)
原式=3mn-5m^2-3m^2+5mn
=8mn-8m^2
=3mn-5m²-3m²+5mn=8mn-8m²=8m(n-m)