Question

Vă rrrrrrrrrroooooooggggggggg!

Answer 1

a) 1730:[(21xb-33)-4]x20-16=184
    folosim metoda mersului invers
   1730:[(21xb-33)-4]=(184+16):20
   1730:[(21xb-33)-4]=200:20=10
   (21xb-33)-4=1730:10=173
   21xb-33=173+4=177
   21xb =177+33
    21x b=210
      b=210:21
     b=10

b) [10+10 x (a-10)]:10-10=10
    [10+10 x (a-10)]:10=10+10=20
    10+10 x (a-10) =20x10=200
     10 x(a-10) =200-10=190
      a-10 =190:10=19
      a=19+10
      a=29

c)  1200-(2x+100):19+2500=3500
    1200 - (2x+100):19=3500-2500=1000
       (2x+100):19 =1200-1000=200
      2x+100 =200x19=3800
     2x =3800-100
     x=3700:2
    x= 1850