4/5×6.7+4.3×0.8-80%
7/9÷5+7/9÷2
39.5×10又7/8-(40-1/2)×7/8
1.25×25×32
3/8×5/7+5/8×4/7
(1/2+1/4+1/8+1/16)×16
（1/2-1/3+1/4)×3×4
0.25×3×4
123×321642/123246
1/4×3.58+1/4×7.42-0.25
4/5×6.7+4.3×0.8-80%
7/9÷5+7/9÷2
39.5×10又7/8-(40-1/2)×7/8
1.25×25×32
3/8×5/7+5/8×4/7
(1/2+1/4+1/8+1/16)×16
（1/2-1/3+1/4)×3×4
0.25×3×4
123×321642/123246
1/4×3.58+1/4×7.42-0.25