Question

-3*(2b-5)-1,8приb=1,5

Answer 1

-3*(2b-5)-1,8 =
= -6b + 15 - 1,8 =
= - 6b +13,2

при b=1,5

-6*1,5 + 13,2 =
= - 9 + 13,2 =
= 4,2

Answer 2

-3*(2b-5)-1,8=-6b+15-1,8=-6b+13,2

при b=1,5 , -6b+13,2=-6·1,5+13,2=-9+13,2=4,2

Answer 3

To evaluate the expression -3*(2b-5)-1,8 when b=1,5, we substitute the value of b into the expression and perform the calculations:

First, substitute b=1.5 into the expression: -3*(2(1.5)-5)-1.8

Next, simplify the expression inside the parentheses: -3*(3-5)-1.8

Simplify further: -3*(-2)-1.8

Multiply: 6-1.8

Finally, subtract: 4.2

Therefore, when b=1.5, the value of the expression -3*(2b-5)-1.8 is 4.2.