2.39×4.4 4.39×5.5 0.239简便运算?
2019-12-05
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2.39×4.4 +4.39×5.5+ 0.239
=2.39x4.4+2.39x5.5+2.39x0.1+2x5.5
=2.39x(4.4+5.5+0.1)+11
=2.39x10+11
=23.9+11
=34.9
=2.39x4.4+2.39x5.5+2.39x0.1+2x5.5
=2.39x(4.4+5.5+0.1)+11
=2.39x10+11
=23.9+11
=34.9
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