计算56.8×35.7+56.8×28.5+64.2×43.2=_.
问题描述:
计算56.8×35.7+56.8×28.5+64.2×43.2=______.
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.