①13－4.85-3.15
②12.5×7.6×0.8
③17.8+2.2×4.5
④6.15×10.1
⑤4.5×3.6+5.5×3.6
⑥12.73+6.2+6.27+3.8
6.4+5.85+3.6 8.28-(1.28+3.7)
0.48×5.3+0.48×4.7 5.7×1.8+1.2
①8.47+12.53-1.2 ②50-19.8-20.2 ③19.4+4.58+5.42
45-6.58-7.42
6.92×14.3+14.3×3.08
1.25×7.9×0.8
①46.69-8.19-1.81
②99×78
③8.24-（2.24+1.9）
④365×99+365
⑤32×25×125
⑥4.38+2.75+5.62+6.25
5.4+0.74+4.6=5.4++0.74
4.04+13.57+2.43=4.04+(◯）
48.72-0.2-0.8=48.72-(◯）
2.3+5.4+8.7+3.6=（ ◯ ）◯（ ◯ ）