Question

Afla numarul necunoscut
A) (y÷2)•3=10•3
B) ( 7•9-b•)-9÷3=20
C) ( 60-10÷(37-4•x)=50
D) 20•10•30•40•a=0
Dau coroana

Answer 1

A) (Y:2)×3 = 10×3
(Y:2)×3 = 30
Y:2 = 30:3
Y:2 = 10
Y = 10×2
Y = 20

B) (7×9-b)-9:3 = 20
(63-b)-3 = 20
(63-b) = 20+3
63-b = 23
b = 63-23
b = 40

C) [60-10:(37-4×X)] =50
10:(37-4×X) = 60-50
10:(37-4×X) = 10
37-4×X = 10:10
4×X = 37-1
4×X = 36
X = 36:4
X = 9

D) 20×10×30×40×a = 0
a = 0