举一反三练习

A 35.7+18.43-8.43 B 42.6-15.3+5.3 C 19.8-6.75-3.25 D 16.4+24.6+3.6

A 56.8+9.97-6.97 B 37.5-12.4+2.4 C 25.6-8.3-1.7 D 14.7+38.5+5.3

A 48.2+13.56-3.56 B 61.4-23.7+3.7 C 33.6-14.8-5.2 D 27.9+19.3+2.1

A 72.5+16.84-6.84 B 53.8-18.6+8.6 C 41.2-9.35-0.65 D 18.6+25.4+11.4

A 63.9+24.15-4.15 B 45.7-16.8+6.8 C 52.4-17.6-2.4 D 36.8+42.7+3.2