<span>d+1/5=4/7+3/7</span>
<span>д+1/5=7/7</span>
<span>д=1-1/5</span>
<span>д=4/5</span>
<span>
</span>
<span><span>f+4/5=4/7+3/7</span></span>
<span><span>f+4/5=7/7</span></span>
<span><span>f=1-4/5</span></span>
<span><span>f=1/5</span></span>
<span><span>
</span></span>
<span><span><span>b+2/5=4/7+3/7</span></span></span>
<span><span><span>b+2/5=7/7</span></span></span>
<span><span><span>b=1-2/5</span></span></span>
<span><span><span>b=3/5</span></span></span>
3344×8=26,752
4128×7=28,896
20409×4=81,636
30507×8=244,056
12008÷8=1,501
14096÷8=1,762
4401÷9=489
22122÷9=2,458
А) 14 прямоугольников;
2) 21 прямоугольник
а вот второе задание я не понял, тут же нет закрашенных частей :\
168 : 2 = 84 176 : 2 = 88
84 : 2 = 42 88 : 2 = 44
42 : 2 = 21 44 : 2 = 22
21 : 3 = 7 22 : 2 = 11
7 : 7 = 1 11 : 11 = 1
168 = 2*2*2*3*7 176 = 2*2*2*2*11
192 : 2 = 96 196 : 2 = 98
96 : 2 = 48 98 : 2 = 49
48 : 2 = 24 49 : 7 = 7
24 : 2 = 12 7 : 7 = 1
12 : 2 = 6 196 = 2*2*7*7
6 : 2 = 3
3 : 3 = 1
192 = 2*2*2*2*2*2*3 250 : 2 = 125
125 : 5 = 25
25 : 5 = 5
5 : 5 = 1
250 = 2*5*5*5
А) 6/42
б) 35/42
в) 9/42
г) 32/42
д) 16/42
с) 9/42