№1361(2,4)
2)
(m + 4/15) - 2/15 = 0.8
m + 4/15 - 2/15 = 8/10
m + 2/15 = 4/5
m = 4/5 - 2/15 = 12/15 - 2/15 = 10/15
m= 2/3
===============================
(2/3 +4/15) - 2/15 = 0.8
(10/15 + 4/15) - 2/15 = 0.8
14/15 - 2/15 = 0.8
12/15 = 0.8
4/5 = 0.8
0.8=0.8
4)
(y + 5/18) +4/9 = 5/9
y + 5/18 = 5/9 - 4/9
y + 5/18 = 1/9
y = 1/9 - 5/18 = 2/18 - 5/18 = - (5/18 - 2/18) =-3/18
y = - 1/6
================================
( - 1/6 + 5/18) + 4/9 = 5/9
( - 3/18 + 5/18) + 4/9 = 5/9
2/18 + 4/9 = 5/9
1/9 + 4/9 = 5/9
5/9 = 5/9
№ 1362(2,4)
2)
- (3y + 4) + (2y - 1) = 0
- 3y - 4 + 2y - 1 = 0
-y - 5 = 0
-y = 5
y = -5
===================
- (3 * (-5) + 4) + (2*(-5) - 1) = 0
- (-15 + 4 ) + (-10-1) = 0
- (- 11) + (-11) = 0
11 + (-11) =0
0=0
4)
3(y-5) - 2(y-4) = 8
3y - 15 - 2y + 8 = 8
y -7=8
y=8 +7
y = 15
================
3(15-5) - 2(15-4) = 8
30 - 22 =8
8 = 8