Question

vreau o rezolvare la ex.25,26,27,28

Answer 1

ex25 2(3+m+m)=134 3+ m+ m=134÷2 3+2m=67 2m=67-3 2m=64 m=64÷2 m=32 t=32+3 t=35 proba 2 (t+m)=134 2(35+32)=134 2×67=134 ex26 a+b=306 a- b= b/4 a=b/4+b a= b/4+4b/4 a=5b/4 5b/4 +b =306 5b/4+4b/4=306 9b/4=306 9b =306 ×4 9b =1224 b=1224÷9 b=136 a+136=306 a=306-136 a=170 ex27 a+b+c+d=581 11+ b+ b+1+b+2=581 11+3b+3=581 14+3b=581 3b=581 -14 3b=567 b=567÷3 b=189 c=190 d=191 a=11 ex28 4000/5=800=1/5 3/5=800×3 =2400 2400/8=300=1/8