Question

Раскройте скобки и найдите значения выражения:
1,4 - (0,7 - 3,2) + 6(1 1/3 - 2 1/4) =
Упростите выражения:
а) - 3 3/1а * 0.6b * (-2c) =
б) 2.8 - (4.2а + 3.4) + (7.1 - 1.3а) =
в) 1 2/3(3x + 0.6y) - 4(y + x) =
Решите уравнения:
3(x +1) - 2.4(x -0.5) = - 0.6

Answer 1

1.4 - (0.7 - 3.2) +6*(1   1/3 - 2  1/4) = 1.4 - 0.7 + 3.2 +6*(4/3 - 9/4) = 
 = 0.7 + 3.2 +6* 4/3 - 6*9/4 = 3.9 + 8 - 13,5 = 11,9 - 13,5 = -1,6
==
-3   1/3a * 0.6b * (-2c) = -10/3a * (-12bc) = 10a * 4bc = 40abc
==
2.8 - (4.2a + 3.4) + (7.1 - 1.3a) = 2.8 - 4.2a - 3.4 +7.1 - 1.3a = -0.6 -5.5a + 7.1 =
= 6.5 - 5.5a
==
1  2/3 * (3x + 0.6y) - 4*(y + x) = 5/3 * (3x + 0.6y) - 4y - 4x =
= 5x + 5*0.2y -4y - 4x = x + y - 4y = x - 3y
==
3(x + 1) - 2.4*(x - 0.5) = -0.6
3x + 3 - 2.4x  +  1.2 = -0.6
0.6x + 4.2 = -0.6
0.6x = -0.6 - 4.2
0.6x = -4.8
x = -4.8/0.6
x = -8 

Answer 2

Ответ на фото
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