1.20\5=4
2.35\7=5
3.4+5=9
4.6*8=48
7.400\50=8
8.8*9=72
9.3*9=27
10.72-27=45
11.480\48=10
12.45+10=55
63600:80-15×26=795-15×26=795-390=405
1) ( - 4*2/7 + 3* 3/14) * (-14)
1. 2.
( - 8/7 + 9/14) * (-14)
1) - 8/7 + 9/14 оз: 14
- 2*8/14+ 9/14
- 16/14 + 9/14
-7/14 = - 1/2 = - 0,5
2) - 0,5* (-14) = 7
Ответ :7
2)
а) 8х+10 = 3х - 10
8х-3х = - 10-10
5х = - 20
х= - 20/5
х= - 4
б) 20 + 30х = 20 + х
30х - х =20 - 20
29х = 0
х= 0
в) 26 - 5у = 2-9у
-5у +9у = 2 - 26
4х = - 24
х= - 6
г) 9х + 11 = 13х - 1
9х - 13х = - 1 - 11
-4х = - 12
х= 3