Question

Упростите выражение: 1) -4,2x + (-6y) 2) 8m + 5p - 13m - p 3) k - (17 - k) + (-k + 30) 4) -6(4+a) + 8(a-6) Найдите значение выражения: 1) (-1,42 - (-3,22)) : (-0,8) + (-6) * (-0,7) Чему равно значение выражения 2(4a + 3b) - 3(2a + 6b) если 6b - a=-1,9? Упростите выражение 5(-1,4a + 3) - (1 - 2,5a) - 4(0,8a + 3) и вычислите его значение при a= 5/7

Answer 1

1) -4,2x + (-6y)=10.4(x+y)
2)8m + 5p - 13m - p=(8m-13m)-(5p+ p)
3) k - (17 - k) + (-k + 30)=(k^2-k)+(17+30)
остальное также

Answer 2

1. -4,2x + (-6y) can be simplified as -4.2x - 6y.
2. 8m + 5p - 13m - p can be simplified as (8m - 13m) + (5p - p) which further simplifies to -5m + 4p.
3. k - (17 - k) + (-k + 30) can be simplified as k - 17 + k + (-k) + 30, which simplifies to k - 17 + k - k + 30. Simplifying further, we have 2k + 13.
4. -6(4+a) + 8(a-6) can be simplified as -24 - 6a + 8a - 48. Combining like terms, we get 2a - 72.

Now, let's solve the expression:

1. (-1.42 - (-3.22)) / (-0.8) + (-6) * (-0.7) First, we simplify the expression inside the parentheses: -1.42 + 3.22 / (-0.8) + (-6) * (-0.7) Next, we perform the division: -1.42 + 3.22 / -0.8 + (-6) * (-0.7) Now, we calculate the division: -1.42 + (-4.025) + (-6) * (-0.7) Next, we perform the multiplication: -1.42 - 4.025 + (-6) * (-0.7) Finally, we multiply: -1.42 - 4.025 + 4.2 Now, we add: -5.445 + 4.2 The final result is -1.245.

Next, let's solve the expression: 2(4a + 3b) - 3(2a + 6b) Given that 6b - a = -1.9, we can substitute this value into the expression: 2(4a + 3b) - 3(2a + 6b) = 2(4a + 3b) - 3(2a + 6(-1.9)) Simplifying the expression further: = 2(4a + 3b) - 3(2a - 11.4) = 2(4a + 3b) - 6a + 34.2

Now, let's simplify the expression: 5(-1.4a + 3) - (1 - 2.5a) - 4(0.8a + 3) Given that a = 5/7, we substitute this value into the expression: 5(-1.4(5/7) + 3) - (1 - 2.5(5/7)) - 4(0.8(5/7) + 3) Simplifying the expression further: = 5(-2 + 3) - (1 - (25/7)) - 4((4/5) + 3) = 5(1) - (1 - (25/7)) - 4((4/5) + 3) = 5 - (1 - (25/7)) - 4((4/5) + 3) = 5 - (1 - 25/7) - 4((4/5) + 3) = 5 - (7/7 - 25/7) - 4((4/5) + 3)