1) 2x + 3x = (2 + 3) x = 5x
2) 7x - 4x = (7 - 4) x = 3x
3) 3y + 9y = ( 3 + 9)x = 12x
4) 8x + 3x - x = 8x + 3x - 1x = (8 + 3 - 1) x = 10x
5) x + 4x + 5x = 1x + 4x + 5x = (1 + 4 + 5) x = 10x
6) 8x + 3x -x = 8x + 4x - 1x = (8 + 3 - 1) x = 10x
7) 10x + 7x - 8x = (10 + 7 - 8) x = 9x
8) 9y + 2y - 4y = (9 + 2 - 4) y = 7
130х=67000-2000
130х=65000
х=65000/130
х=500
А) (х-87)-27=36
х-87=36+27
х-87=63
х=63+87
х=150
Проверяем: (150-87)-27=36
Ответ: х=150
б) 87-(41+у)=22
41+у=87-22
41+у=65
у=24
Проверяем: 87-(41+24)=22
Ответ:у=24
Вычислите: 1) 12,6:3; 4,8:2; 3:2; 2) 3,2:4; 6,4:8; 7,2:9; 3) 6,4:2; 8,1:9; 4,2:7; 4) 2,4:8; 4,2:6; 5,4:9; Зарание спасибо!
Заират
1)<span>12,6:3=4,2
</span> 4,8:2=2,4
3:2=1,5
2)<span>3,2:4=0,8
</span><span>6,4:8=0,8
</span><span>7,2:9=0,8
3)6,4:2=3,2
</span><span>8,1:9=0,9
</span><span>4,2:7=0,6
4)</span><span>2,4:8=0,3
</span><span>4,2:6=0,7
</span><span>5,4:9=0,6</span>