8/9×(-2.7b+2,5)-2/3×(1/3-1.2b)=-2 решить - вопрос №68687968927252313122 от deaflora 21.09.2021 18:12

Question

Математика: 8/9×(-2.7b+2,5)-2/3×(1/3-1.2b)=-2 решить

deaflora · Answer

8/9×(-2,7b)=8/9×(-2 7/10b)=8/9×(-27/10b)= -12/5b

8/9×2,5=8/9×2 1/2=8/9×5/4=10/9

-12/5b+10/9

-2/3×1/3= -2/9

-2/3×(-1,2b)=2/3×1 1/5b=2/3×6/5b=4/5b

-2/9+4/5b

-12/5b+10/9-2/9+4/5b= -2
-8/5b= -2-8/9
b= -26/9×(-5/8)
b=65/36
b= 1 29/36