3.2×56.3+0.32×437
=3.2×56.3+3.2×43.7
=3.2(56.3+43.7)
=3.2×100
=320。
原式
=3.2×56.3+0.32×10×43.7
=3.2×56.3+3.2×43.7
=3.2×(56.3+43.7)
=3.2×100
=320
=3.2×56.3+3.2×43.7☞(就是0.32乘10,437除以10,整体数值大小不变)
=3.2×(56.3+43.7)☞(括号内相加等于100)
=3.2×100
=320
解:原式=3.2乘以(56.3+43.7)=3.2乘以100=320,加油