Răspuns:
4. a) x= -170
b) y= 1992
c) z= -747
5. a) x=27
b) y= -11
c) z=6
6. a) x=160
b) y=380
c) z=342
7. a) x= -24
b) y=100
c) z= -20
Explicație pas cu pas:
4. a) x= -100-70 =>
=> x= -170
b) y= 2000-8 =>
=> y= 1992
c) z= -718-29 =>
=> z= -747
5. a) 3x÷3=81÷3 =>
=> x=81÷3 =>
=> x=27
b) -11y=121 =>
=> y= -11
c) -35z= -210 /÷(-35) =>
=> z=6
6. a) -x÷8=-20 =>
=> - 1 supra 8 x=-20 /×(-8) =>
=> x=160
b) 1 supra 38 y=10 /×38 =>
=> y= 380
c) -z÷19=-18 =>
=> - 1 supra 19 z=-18 /×(-19) =>
=> z= 342
7. a) 3x=-72 /÷3 =>
=> x=-24
b) -8y=-800 /÷(-8) =>
=> y=100
c) 22z=-440 /÷22 =>
=> z= -20
