Question

. Afla numărul necunoscut
a) (y:2)×3 =10×3. B) (7×9-b×5)-9:3=20 c) 60-10:(37-4×g)=50. d) 20×10×30×40×a=0
​

Answer 1

Răspuns:

a) (y:2)×3=30

y:2=30:3

y:2=10

y=10×2

y=20

Answer 2

Răspuns:

a) y=5

b) b= 56

c)g=9.5

d)a=0

Explicație pas cu pas:

$a) \: (y \div 2) \times 3= 10 \times 3 \\ y \div 2 = 10 \\ y = 10 \div 5 \\ y = 5$

$b) \: (7 \times 9 - b \times 5) - 9 \div 3 = 20 \\ (63 - b \times 5) - 3 = 20 \\ 63 - b = 20 \div 5 + 3 \\ 63 - b = 4 + 3 \\ - b = 7 - 63 \\ - b = - 56 \\ b = 56$

$60 - 10 \times (37 - 4 \times g) = 50 \\ 10 \times (37 - 4 \times g) = - 10 \\ 37 - 4 \times g = - 1 \\ - 4 \times g = - 38 \\ g = 9.5$