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Afla numerele necunoscute:(a+8):2=7; (c-75)=3=5; 4x(b-5)=40 ; 80:(dx10)=8; 2xX+425=425; 500+5xY=500; 15x6=tx30.

Răspuns :

1. a+8=7*2
a=14-8
a=6 
Restul la fel

a) 4x(b-5)= 40
(b-5)=40:4
b-5=10
b=10-5
b=5

b) 80:(dx10)=8
(dx10)=80x8
dx10=640
d=640:10
d=64

c) 2xX+425=425
2xX= 425 -425
2xX=0
X=0:2
X=0
d) 500+5xY=500
5xY=500-500
5xY=0
Y=0:5
Y=0
 

e) 16x5=Tx30
15x6=90
T= 90:30
T= 30