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8.9×0.2+8.8×0.2+8.7×0.2+...+8.1×0.2=?
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8.9×0.2+8.8×0.2+8.7×0.2+...+8.1×0.2=?
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答案和解析
8.9×0.2+8.8×0.2+8.7×0.2+...+8.1×0.2
＝(8.9+8.8+...+8.1)×0.2
=9×8.5×0.2
=9×1.7
=10×1.7-1.7
=17-1.7
=15.3
＝(8.9+8.8+...+8.1)×0.2
=9×8.5×0.2
=9×1.7
=10×1.7-1.7
=17-1.7
=15.3
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