4×4.38×2.5
34.8-(14.8+3.4)
1.87+1.87×99
2.21+3.7+0.79+6.3
39×88+88×61
56×25×4
20×[840÷(36-8)]
3.8+5.46+2.2
2.8×0.5+0.1×2.8
0.25×7.9×0.4
8.56×101-8.56
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﹣(+)