Question

(0,4a+3)-(0,5a-6),a=90 (3a+7b)-(4a+3b),a=0,2;b=-0,8

Answer 1

(0,4a+3)-(0,5a-6)=0,4a+3-0,5a+6=-0,1a+9

-0,1a+9 при a=90 ↓

-0,1*90+9=-9+9=0

Ответ: 0

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(3a+7b)-(4a+3b)=3a+7b-4a-3b=-a+4b ↓

-a+4b при a=0,2   b=-0,8

-0,2+4*(-0,8)=-0,2-3,2=-3,4

Ответ: -3,4

Answer 2

0.4а+3-0.5а+6=-0.1а+9=-0.1×90+9=0
3а+7b-4a-3b=-a+4b=-0.2-0.8=1

Answer 3

To evaluate the given expressions, simply substitute the values of 'a' and 'b' into the expressions and then perform the calculations. Let's go through each one step by step:

1. (0, 4a + 3) - (0, 5a - 6), a = 90

Substitute 'a' with 90 in the expressions: (0, 4 * 90 + 3) - (0, 5 * 90 - 6)

Now calculate: (0, 363) - (0, 444) (0 - 0, 363 - 444) (0, -81)

So, the result is (0, -81).

2. (3a + 7b) - (4a + 3b), a = 0.2; b = -0.8

Substitute 'a' with 0.2 and 'b' with -0.8 in the expressions: (3 * 0.2 + 7 * -0.8) - (4 * 0.2 + 3 * -0.8)

Now calculate: (0.6 - 5.6) - (0.8 - 2.4) (-5) - (-1.6) -5 + 1.6 -3.4

So, the result is -3.4.