1) 15+5x2-7=15+14-7=29-7=22
2)
[tex]4 + {8}^{2} \div 2 = 4 + 64 \div 2 = 4 + 32 = 36[/tex]
3)
[tex] {(3 - 1)}^{3} \times 5 + 12 = {2}^{3} \times 5 + 12 = 8 \times 5 + 12 = 40 + 12 = 52[/tex]
4) 50-2x(9+7)=50-2x16=50-32=18
5) 20:(2+3x6)=20:(2+18)=20:20=1
6) 20:(2+3)x6=20:5x6=4x6=24
7) 132:3x0.2=44x0.2=8.8
8) 25x4:2=100:2=50
9)
[tex] {(2 + 1)}^{2} - 2 \times 4 = {3}^{2} - 2 \times 4 = 9 - 8 = 1[/tex]
10) 340-(25x9+47)=340-(225+47)=340-272=68
11)
[tex]145 - 2 \times {5}^{2} = 145 - 2 \times 25 = 145 - 50 = 95[/tex]
12)
[tex]180 - {(25 - 3 \times 5)}^{2} = 180 - {(25 - 15)}^{2} = 180 - {10}^{2} = 180 - 100 = 80[/tex]
13)
[tex]13 \times {(100 \div 5 - 13)}^{2} = 13 \times {(20 - 13)}^{2} = 13 \times {7}^{2} = 13 \times 49 = 637[/tex]
14)
[tex] {(1.5 - 3 \times 0.4)}^{3} = {(1.5 - 1.2)}^{3} = {0.3}^{3} = 0.027[/tex]
15) 5+4:2-2x2=5+2-4=7-4=3
