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52×4.7 4.7×15 6.7×53简便运算
如题0v0
人气:239 ℃ 时间:2020-04-23 06:51:22
解答
52×4.7+4.7×15+6.7×53
=(52+15)×4.7 +6.7×53
=67×4.7 +67×5.3
=67×(4.7+5.3)
=67×10
=670
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