计算56.8×35.7+56.8×28.5+64.2×43.2=________.
6420
分析:56.8×35.7+56.8×28.5+64.2×43.2,运用乘法分配律进行简算.
解答:56.8×35.7+56.8×28.5+64.2×43.2,
=56.8×(35.7+28.5)+64.2×43.2,
=56.8×64.2+64.2×43.2,
=(56.8+43.2)×64.2,
=100×64.2,
=6420.
故答案为:6420.
点评:此题考查的目的是理解乘法分配律的意义,并且能够灵活运用乘法分配律进行简便计算.