5/9×86又7/11+5/11×1/9+4×5/ - 知识问答

5/9×86又7/11+5/11×1/9+4×5/11简算

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5/9×86又7/11+5/11×1/9+4×5/11
=5/9x81+5/9x5又7/11+5/11x1/9+4x5/11
=45+5/9x62/11+5/11x1/9+5/11x4
=45+5/11x62/9+5/11x1/9+5/11x4
=45+5/11x(62/9+1/9+4)
=45+5/11x11
=45+5
=49
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