a=2 b=3 c=4 . a. 2a + b - c B. 2ab + 2c - a

2a + b - c =..
= 2(2) + (3) - (4)
= 4 + 3 - 4
= 3

2ab + 2c - a =..
= 2(2)(3) + 2(4) - (2)
= 12 + 8 - 2
= 18

smoga brmanfaat.

a=2 b=3 c=4 .
a. 2.2 + 3- 4
4+(-1)
3

b. 2. 2.3. + 2.4 - 2
12 + 8 - 2
20-2
18

maaaf kalo salah