1.2100-21×53+2255
2.(103-336÷21)×15
3.800-(2000-9600÷8)
4.40×48-(1472+328)÷5
5.(488+344)÷(202-194)
6.2940÷28+136×7
7.605×(500-494)-1898
8.(2886+6618)÷(400-346)
9.9125-(182+35×22)
10.(154-76)×(38+49)
11.3800-136×9-798
12.(104+246)×(98÷7)
13.918÷9×(108-99)
14.(8645+40×40)÷5
15.(2944+864)÷(113-79)
16.8080-1877+1881÷3
17.(5011-43×85)+3397
18.2300-1122÷(21-15)
19.816÷(4526-251×18)
20.(7353+927)÷(801-792)
21.(28+172)÷(24+16)
22.6240÷48+63×48
23.950-28×6+666
24.86×(35+117÷9)
25.2500+(360-160÷4)
26.16×4＋6×3
27.39÷3＋48÷6
28.24×4－42÷3
29.7×6-12×3
30.56÷4＋72÷8