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100•[25-5•(x-3)+2]÷4=300

Răspuns :

100×[25-5×(x-3)+2]=300×4
25-5×(x-3)+2=1200:100
25-5×(x-3)=12-2
5×(x-3)=10+25
x-3=35:5
x=7+3
x=10

ElyElyEly
25-5•(x-3)+2]:4=300:100=20•(x-3)+2:4=3=x-3+2:4=20-3=x-5:4=17
X-5:4=17
X=17+5:4=
X=22:4=
X=5,2