52×4.7 4.7×15 6.7×53简便运算如题0v0

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52×4.7 4.7×15 6.7×53简便运算如题0v0
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52×4.7 4.7×15 6.7×53简便运算如题0v0
52×4.7 4.7×15 6.7×53简便运算
如题0v0

52×4.7 4.7×15 6.7×53简便运算如题0v0
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

52×4.7
=(50+2)×4.7
=235+9.4
=244.4
4.7×15
=4.7×(10+5)
=47+23.5
=70.5
6.7×53
=6.7×(50+3)
=335+22.1
=357.1