Question

Pls ajutor.
ex. 3
e urgent va rooooogg
100p.​

Answer 1

Răspuns:

a ×42 +720 - 720 :9 =1060

a ×42 +720 - 80 =1060

a ×42 +720 =1060 +80

a ×42 +720 =1140

a ×42 =1140 - 720

a ×42 =420

a =420 :42

a =10

100 - b :6 +350 :7 =144

100 - b :6 +50 =144

100 - b :6 =144 - 50

100 - b :6 =94

b :6 =100 - 94

b :6 =6

b =6 ×6

b =36

E=100 ×a - 10 ×b

E =100 ×10 - 10 ×36

E =1000 - 360

E =640 (copii)

Answer 2

• Răspuns:

E = 100a - 10b

= 100×10 - 10×36

= 1000 - 360

E = 640

• Explicație pas cu pas:

a × 42 + 720 - 720 : 9 =1060

42a + 720 - 80 = 1060

42a + 720 = 1060 + 80

42a + 720 = 1140

42a = 1140 - 720

42a = 420

a = 420 : 42

a = 10

100 - b : 6 + 350 : 7 = 144

100 - b : 6 + 50 = 144

100 - b : 6 = 144 - 50

100 - b : 6 = 94

b : 6 = 100 - 94

b : 6 = 6

b =6 × 6

b = 36