举一反三练习

A 35.8+17.4-7.4 B 46.2-13.5+6.5 C 18.76-4.32-5.68 D 52.4+9.87+0.13

A 7.8+5.63+2.2 B 14.56-3.28-1.72 C 23.4-8.7+3.7 D 9.12+6.45-3.45

A 32.6+18.9-8.9 B 15.47-2.35-7.65 C 8.63+4.5+1.37 D 27.5-6.8+3.8

A 6.48+9.9+0.1 B 20.75-4.6-5.4 C 13.2-5.7+4.7 D 3.56+7.24+6.44