Question

daca x-y=145 si y-z=155 aflati x-z

Answer 1

x-y=145    x=145+y
y-z=155    z=y-155
x-z=145+y-y+155=300

Answer 2

y-z=155=> z=y-155

x-z=x- (y-155)=x-y+155

x-y=145=> y=x-145

x-y+155=x-(x-145)+155=x-x+145+155=0+145+155=300

deci x-z=300

exercitiul scris pe lung asa vine

x-z=x- (y-155)=x-y+155=x-(x-145)+155=x-x+145+155=0+145+155=300