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EX. 9,10,11 URGENT!!!!!!!!!!!!!!!!!!!!

EX 91011 URGENT class=

Răspuns :

9. a×c+b×c=
c×(a+b)=
15×13= 195

10. x:z+y:z=
x/z + y/z= x+y/z = 9/137

11. xy+yz=147
y×(x+z)=147
y=7
7×(x+z)=147
x+z=147:7
x+z= 21