Question

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

Answer 1

Răspuns:

( а) ( у 2-х ) * 3 = 10 * 3

( у 2-х ) * 3 = 30

y : 2 = 30 : 3

y : 2 = 10

y = 10 * 2

y = 20

б) ( 7 * 9 - в * 5 ) - 9 : 3 = 20

( 63 а - (b * 5 ) - 3 = 20

На 63 - б * 5 = 20 + 3

На 63 - б * 5 = 23

б * 5 = 63 - 23

б * 5 = 40

b = 40 : 5

b = 8

с) 60 - 10 : ( 37 - 4 * х = 50

10 место: ( 37 - 4 * х = 60, то 50

10 место: ( 37 - 4 * х ) = 10

37 - 4 * х = 10 х 10

37 - это 4-х * х = 100

4 * х = 100 - 37

4 * х = 63

х = 63 : 4

х = 15 и r-3

г) 20 * 10 * 30 * 40 * a = 0

200 * 30 * 40 * a = 0

6000 * 40 * a = 0

240000 * a = 0

а = 240000 : 0

a = 0

Answer 2

Explicație pas cu pas:

a) (y:2)×4=10×3

(y:2)×4=30

y:2=30×4

y:2=120

y=120×2

y=240