关于分数和小数的口算题400道

关于分数和小数的加、减法口算题：
(1) 54.76 - 51.12 =
(2) 61.45 + 20.7 =
(3) 59.46 + 18.28 =
(4) 46.31 + 21.76 =
(5) 21.85 + 37.08 =
(6) 42.88 - 12.63 =
(7) 84.75 + 13.96 =
(8) 42.39 - 20.92 =
(9) 29.54 - 20.12 =
(10) 76.13 + 13.37 =
(11) 26.31 - 22.07 =
(12) 93.99 - 36.18 =
(13) 69.88 + 27.33 =
(14) 61.04 + 17.67 =
(15) 28.54 - 17.35 =
(16) 9/7 - （ 2/7 – 10/21 ）
(17) 2/10+4/10
(18) 11/14-8/14
(19) 3/8+1/8
(20）1/4+1/5

1.(1+1/2)(1+1/3)(1+1/4)......(1+1/100)
2.(1-1/2)(1-1/3)(1-1/4)......(1-1/100)
3.8+2-8+2
4.25*4/25*4
5.7.26-(5.26-1.5)
6.286+198
7.314-202
8.526+301
9.223-99
10.6.25+3.85-2.125+3.875
11.9-2456*21
12.0.5/11.5-4*2.75
13.1/2×3/5
14.3.375+5.75+2.25+6.625
15.1001－9036÷18
16.3.8×5.25+14.5
17.2.1*4.3+5.7*2.1
18.30×1/3
19.102*45-328
20.2/3×12
21.2.8*3.1+17.6