4a-15b-2 при a=1/4, b= 3/5

Question

4a-15b-2 при a=1/4, b= 3/5

Answer 1

4*1/4-15*3/5-2=-10
1)4*1/4=4/4=1
2)15*3/5=45/5=9
3)1-9=-8
4)-8-2=-10

Answer 2

4×1/4-15×3/5-2=1-9-2=-10