Question

1) 6a-17a+19a-8a= 2) -5x-4(8-3x) = 3) am+bm= 4) 43•15-55•15+7•15= 5) -1,2(2a-3) - (4-5a) - 0,6(1-a), при a = -2,5 6) 8am-16an+12a=

Answer 1

1) 6a-17a+19a-8a= 0а=0
2) -5x-4(8-3x) = -5х-32+12х=7х-32
3) am+bm= m•(a+b)
4) 43•15-55•15+7•15= 15•(43-55+7)=15•(-5)=-75
5) -1,2(2a-3) - (4-5a) - 0,6(1-a)
Если а = -2,5 , то -1,2(2a-3) - (4-5a) - 0,6(1-a)= -1,2(2•(-2,5)-3)-(4-5•(-2,5))-0,6(1-(-2,5))=-1,2(-5-3)-(-4+12,5)-0,6(-1,5)=9,6-8,5+0,9=2
6) 8am-16an+12a=4a(2m-4n+3)

Answer 2

1) 6a-17a+19a-8a=0

2) -5x-4(8-3x) = -5x-32+12x=7x-32

3) am+bm= m(a+b)

4) 43*15-55*15+7*15=15*(43+7-55)=-5*15=-75

5) -1.2(2a-3) - (4-5a) - 0.6(1-a)=-2.4a+3.6-4+5a-0.6+0.6a=-1+3.2a

при a = -2,5;  -1+3.2a=-1-3.2*2.5=7

6) 8am-16an+12a=4a*(2m-4n+3)

Answer 3

Let's solve the equations one by one:

1. 6a - 17a + 19a - 8a Combining like terms, we have: (6 - 17 + 19 - 8)a Simplifying the numbers: 0a Any number multiplied by zero is zero, so the result is: 0

2. -5x - 4(8 - 3x) Distributing the -4 to the terms inside the parentheses: -5x - 4 * 8 + 4 * 3x Simplifying the numbers: -5x - 32 + 12x Combining like terms: (-5x + 12x) - 32 Simplifying the variables: 7x - 32

3. am + bm Here, we can factor out 'm' from both terms: (a + b)m

4. 43 * 15 - 55 * 15 + 7 * 15 Simplifying each multiplication: 645 - 825 + 105 Combining the numbers: (645 - 825) + 105 Simplifying further: -180 + 105 Combining the numbers again: -75

5. -1,2(2a - 3) - (4 - 5a) - 0,6(1 - a), when a = -2.5 Substituting the value of 'a' into the equation: -1.2(2(-2.5) - 3) - (4 - 5(-2.5)) - 0.6(1 - (-2.5)) Simplifying each part: -1.2(-5 - 3) - (4 + 12.5) - 0.6(1 + 2.5) Simplifying further: -1.2(-8) - (16.5) - 0.6(3.5) Multiplying: 9.6 - 16.5 - 2.1 Combining the numbers: 9.6 - 18.6 Calculating: -9

6. 8am - 16an + 12a We can factor out 'a' from each term: a(8m - 16n + 12)