Question

Află nr necunoscut din expresiile de mai jos. a). (×+20)÷12+68=78 b). (×+282-75)÷2=104 c)×inmultit4:10+101=133 d)101 ×[ 101 -(101-102:×)]=202 e.)369 -[(×+112):5+113]=434 f)104:[(×-3 înmulțit 8)×2:8]=13

Answer 1

(x+20):12+68=78
x+20:12+68=78
x+20:12=78-68
x+20:12=10
x+20=10x12
x+20=120
x=120-20
x=100


(x+282-75):2=104
x+282-75=104x2
x+282-75=208
x+282=208+75
x+282=283
x=283-282
x=1

x•4:10+101=133
x•4:10=133-101
x•4:10=32
x•4=32•10
x•4=320
x=320:4
x=80