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Află termenul necunoscut :
a) (a+81÷9)×5=295
b) (b×4+20)÷2=54


Răspuns :

(a+81:9)•5=295 a+9=59 a=50 (b•4+20):2=54 4b+20=108 4b=88 b=22
a)
(a+81:9)x5=295
a+81:9=295:5
a+9=59
a=59-9
a=50
.............................................
b)
(bx4+20):2=54
bx4+20=54x2
bx4+20=108
bx4=108-20
bx4=88
b=88:4
b=22