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6.18*9.9+0.2*6.18巧算(6.8+2.3)*(6.8-2.3)
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6.18*9.9+0.2*6.18巧算(6.8+2.3)*(6.8-2.3)
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答案和解析
6.18*9.9+0.2*6.18
=6.18*(9.9+0.2)
=6.18*10+6.18*0.1
=61.8+0.618
=62.418
(6.8+2.3)*(6.8-2.3)
=9.1*4.5
=40.95
=6.18*(9.9+0.2)
=6.18*10+6.18*0.1
=61.8+0.618
=62.418
(6.8+2.3)*(6.8-2.3)
=9.1*4.5
=40.95
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