1.
а) ( 130 - х ) + 35 = 50
130 - х = 50 - 35
130 - х = 15
- х = 15 - 130
- х = - 115
х = 115
проверка: ( 130 - 115 ) + 35 = 15 + 35 = 50
50 = 50
б) 197 - 37 + у = 200
160 + у = 200
у = 200 - 160
у = 40
проверка: 197 - 37 + 40 = 160 + 40 = 200
200 = 200
2.
а) ( х - 90 ) - 705 = 1000
х - 90 = 1000 + 705
х - 90 = 1705
х = 1705 + 90
х = 1795
проверка: ( 1795 - 90 ) - 705 = 1705 - 705 = 1000
1000 = 1000
б) 1800 + ( 8000 - у ) = 9000
8000 - у = 9000 - 1800
8000 - у = 7 200
- у = 7 200 - 8000
- у = - 800
у = 800
проверка: 1800 + ( 8000 - 800 ) = 1800 + 7200 = 9000
9000 = 9000
1.
а) ( 130 - х ) + 35 = 50
130 - х = 50 - 35
130 - х = 15
- х = 15 - 130
- х = - 115
х = 115
проверка: ( 130 - 115 ) + 35 = 15 + 35 = 50
50 = 50
б) 197 - 37 + у = 200
160 + у = 200
у = 200 - 160
у = 40
проверка: 197 - 37 + 40 = 160 + 40 = 200
200 = 200
2.
а) ( х - 90 ) - 705 = 1000
х - 90 = 1000 + 705
х - 90 = 1705
х = 1705 + 90
х = 1795
проверка: ( 1795 - 90 ) - 705 = 1705 - 705 = 1000
1000 = 1000
б) 1800 + ( 8000 - у ) = 9000
8000 - у = 9000 - 1800
8000 - у = 7 200
- у = 7 200 - 8000
- у = - 800
у = 800
проверка: 1800 + ( 8000 - 800 ) = 1800 + 7200 = 9000
9000 = 9000
Пошаговое объяснение:
1)11,9-154/15=11,9-10 4/15 = 1,9 - 4/15 = 1 9/10 - 4/15 = 1 18/30 + 8/30 = 1 26/30 = 1 13/15
2)16/2 :11 +9 1/6=1 1/2 + 9 1/6 = 1 1/2 + 55/6 = 1 3/6 + 55/6 = 1+ 58/6 =10 2/3
3)(83,2-80 1/6) *3 /13 =(83 2/10 - 80 1/6) * 3/13 = (83 6/30 - 80 5/30) * 3/13 = 3 1/30 * 3/13 = 91/30 * 3/13 = 91/10 * 1/13 = 91/130
4)(0,28+1.1/3):11/30=(0,28+1,33):0,37=1,61:0,37=4,35=4,4