(3.8+12.5)× =× ×8
(4.5×3.2)×=3.2×(×4) 3.2×2.5×12.5=×12.5×
1.2×2.5+0.8×2.5=
50.5×0.2=
×1.36+13.6×=13.6
2.33×0.5×0.4×5=
3.12×4+1.88×4=
3.7×1.4×0.05 12.5×0.4×2.5×8
3.2×2.5×0.125 12.9×101 4.3×2.4+2.4×5.7
22×0.24+2.2×2.6
6.9×101
11.43﹣(0.67+2.43)
12.5×3.2
7.7÷2.5÷0.7
36.7﹣3.02×4﹣7.92
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1
①25×32×1.25
②(+0.375)÷(×)
③×+÷7
④6﹣(+)
①26×15﹣200
②8×4×12.5×0.25
③×+
④12÷[()×]