Question

Ajutor va rog mult de tot!​

Answer 1

Răspuns:

a) x/28=3/7 ⇒x×7=28×3 /÷7 x=4×3 x=12

b) 45/x=3/7 ⇒x×3=45×7 /÷3 x=15×7 x=105

c) (2x+1)=3/7 ⇒(2x+1)×7=3×21 /÷7 2x+1=3×3 2x+1=9/-1 2x=8 x=4

d) 51/(38+x)=3/7 ⇒51×7=(38+x)×3 /÷3 17×7=38+x 119=38+x /-38 x=81