帮我出题目，数学

1.(80÷20+80)÷4=21

2.26 -6 -64 = 20 -64 = -44
3.27 + 3 -48 = 30 -48 = -18
4.28 + 12 -32 = 40 -32 = 8
5.29 + 21 -16 = 50 -16 = 34
6.30 + 30 + 0 = 60 + 0 = 60
7.31 + 39 + 16 = 70 + 16 = 86
8.32 + 48 + 32 = 80 + 32 = 112
9.33 + 57 + 48 = 90 + 48 = 138
10.34 + 66 + 64 = 100 + 64 = 164
11.35 + 75 + 80 = 110 + 80 = 190
12.36 + 84 + 96 = 120 + 96 = 216
13.37 + 93 + 112 = 130 + 112 = 242
14.38 + 102 + 128 = 140 + 128 = 268
15.39 + 111 + 144 = 150 + 144 = 294
5.400÷4+20×5= 200
6.10+12÷3+20=34
7.(80÷20+80)÷4=21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45=115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9=60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70=230
21.18-64÷8= 10
22.42÷6+20=27
23.40-5×7= 5
24.80+60÷3=100
25.41+18÷2= 50
26.75-11×5= 20 <