1)
1)8*3/4=6
2)6-4=2
2)
1)22/21-21/22=43/462
3)
1)1*1/2=1/2
2)1/2-1/3=1/6
4)
1)10*5/8=6 1/4
2) 3*5/6=2 1/2
3)6 1/4-2 1/2=3 3/4
3,187+X=18,593+2,456
3,187+Х=21,049
Х=21,049-3,187
Х=17,862
57/(Х/28)=19
57/19=Х/28
Х=(57*28)/19
Х=84
.Решение : . 80%-100%=30% (процентов)
.x=30%
.x=30×80/100=24 % Значит ответ: 24%.
<h3>12936:</h3>
- 12936 ÷ 3 = 4312
- 4312 ÷ 2 = 2156
- 2156 ÷ 2 = 1078
- 1078 ÷ 2 = 539
- 539 ÷ 7 = 77
- 77 ÷ 7 = 11
- 11 ÷ 11 = 1
12936 = 11 × 7 × 7 × 2 × 2 × 2 × 3
<h3>196:</h3>
- 196 ÷ 2 = 98
- 98 ÷ 2 = 49
- 49 ÷ 7 = 7
- 7 ÷ 7 = 1
196 = 7 × 7 × 2 × 2
<h3>216:</h3>
- 216 ÷ 3 = 72
- 72 ÷ 3 = 24
- 24 ÷ 3 = 8
- 8 ÷ 2 = 4
- 4 ÷ 2 = 2
- 2 ÷ 2 = 1
216 = 2 × 2 × 2 × 3 × 3 × 3
<h3>4120:</h3>
- 4120 ÷ 2 = 2060
- 2060 ÷ 2 = 1030
- 1030 ÷ 2 = 515
- 515 ÷ 5 = 103
- 103 ÷ 103 = 1
4120 = 103 × 5 × 2 × 2 × 2