200.6×7.8+200.6×2.2和0.26×5×0.2的简便算法
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200.6×7.8+200.6×2.2和0.26×5×0.2的简便算法
200.6×7.8+200.6×2.2和0.26×5×0.2的简便算法
200.6×7.8+200.6×2.2和0.26×5×0.2的简便算法
200.6×7.8+200.6×2.2
=(7.8+2.2)×200.6
=10×200.6
=2006
0.26×5×0.2
=0.26×(5×0.2)
=0.26×1
=0.26