Question

3.72×53+6.44×47+27.2×5.3简便计算？

Answer 1

3.72×53+6.44×47+27.2×5.3简便计算
解析：逆用乘法分配律进行简便计算
3.72×53+6.44×47+27.2×5.3
=3.72×53+6.44×47+2.72×10×5.3 ——把27.2写成2.72×10
=3.72×53+6.44×47+2.72×53 ——先算10×5.3得53
=（3.72+2.72）×53+6.44×47 ——提取公因数53
=6.44×53+6.44×47
=6.44×（53+47） ——提取公因数6.44
=6.44×100
=644

Answer 2

3.72×53+6.44×47+27.2×5.3，简便计算：可以看到53=5.3×10，且最后一项也含有5.3，所以3.72×53+6.44×47+27.2×5.3
=37.2×5.3+6.44×47+27.2×5.3
=5.3×(37.2+27.2)+6.44×47
=5.3×64.4+6.44×47，这里同样可以看到64.4=6.44×10，且后一项也含有6.44，所以
5.3×64.4+6.44×47
=53×6.44+47×6.44
=(53+47)×6.44
=100×6.44
=644

Answer 3

因为27.2×5.3=2.72×53，所以原式等于3.72×53+2.72×53+6.44×47运用乘法分配逆运算就是53×（3.72+2.72）+47×6.44=6.44×53+47×6.44=6.44×（53+47）=644

Answer 4

你可以把后面的27.2×5.3改成2.72×53。
那么算数，就相当于3.72×53+2.72×53+6.44×47。
接下来你就会算出来。
就变成了6.44×53+6.44×47
最后等于6.44×100，也就是644。

Answer 5

3.72×53+6.44×47+27.2×5.3
＝3.72×53+2.72×53+6.44×47
＝（3.72+2.72）×53+6.44×47
＝6.44×53+6.44×47
＝6.44×（53+47）
＝6.44×100
＝644
简便方法：乘法分配律