三点28×5点7+6点7×5点七等于多少简便方法是什么?
3个回答
2021-06-11
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3.28×5.7+6.7×5.7
=5.7×(3.28+6.7)
=5.7×9.98
=5.7×(10-0.02)
=5.7×10-5.7-0.02
=57-0.114
=56.886
=5.7×(3.28+6.7)
=5.7×9.98
=5.7×(10-0.02)
=5.7×10-5.7-0.02
=57-0.114
=56.886
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展开全部
3.28×5.7+6.7×5.7
=(3.28+6.7)×5.7
=9.98×5.7
=(10-0.02)×5.7
=57-0.114
=56.886
=(3.28+6.7)×5.7
=9.98×5.7
=(10-0.02)×5.7
=57-0.114
=56.886
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简便计算:
3.28x5.7十6.7x5.7
=5.7x(3.28十6.7)
=5.7x9.98
=5.7x(10一0.02)
=57一0.114
=56.886
3.28x5.7十6.7x5.7
=5.7x(3.28十6.7)
=5.7x9.98
=5.7x(10一0.02)
=57一0.114
=56.886
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