a) (a+81:9)×5=295
(a+9)×5=295
a+9=295:5
a+9=59
a=59-9
a=50( dinti are vulpea urecheata)
b) (b×4+20):2=54
b×4+20=54×2
b×4+20=108
b×4=108-20
b×4=88
b=88:4
b=22( ore doarme lenesul pe zi)
Explicație pas cu pas:
(a+81:9)×5=295
(a+9)=295:5
a=50
v:(50+81:9)×5=
(50+9)×5=
59×5=
295
(b×4+20):2=54
(b×4+20)=54×2
(b×4+20)=108
b=22
v:(22×4+20):2=
(88+20):2=
108:2=
54
