（1）6.7×

11

4

+3.3×275%+275%
=6.7×2.75+3.3×2.75+2.75
=（6.7+3.3）×2.75+2.75
=10×2.75+2.75
=27.5+2.75
=30.25
（2）0.25×3.2-0.25+1.8×25%
=0.25×（3.2-1+1.8）
=0.25×4
=1