10.1乘3.2=（10+0.1）×3.2=10×3.2+0.1×3.2=32+0.32=32.32
10.1乘3.2的简便计算=（10+0.1）X（3+0.2）=30+2+0.3+0.02=32+0.3+0.02=32.3+0.02=32.32
