X×8=40
x=40÷8
x=5
x÷8=40
x=8×40
x=320
x+8=40
x=40-8
x=32
x-8=40
x=40+8
x=48
8/5 = 1, 3/5
12/7 = 1, 5/7
35/8 = 4, 3/8
37/11 = 3, 4/11
40/4=10 дм равна 1 сторона
10=1м
Р=1*4=4 м
S=1*1=1м2
1) 37*2+40= 114
2) а. 140
б. 700
3) <span>120-80:4+40</span>
213
<span>(120-80):4+40</span>
<span> 123</span>
<span> <span>(900-400):10*5</span></span>
<span><span> 123</span></span>
<span><span> <span>900-400:10*5</span></span></span>
<span><span><span> 231</span></span></span>