7,8a+2,3a-5a при a = 6

Question

7,8a+2,3a-5a при a = 6

Answer 1

7,8a+2,3a-5a=(7,8+2,3-5)*a=5.1*a=5.1*6=30.6

Comments

нет 6(a+1,5)-2,8a при a=1,5

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6(a+1,5)-2,8a=6a+9-2.8a=9+3.2a=9+3.2*1.5=9+4.8=13.8

Answer 2

А=6
7,8*6+2,3*6-5*6
45,6+13,8-30
59,4-30=29,4

Comments

спасибо