Question

13.

Afta factorul necunoscut !
a) 63 + 2x a - 12 = 41.
e) 79 - 5:a+15=b=9
a*7 + 63:9 + 4x3 = 40
dl 100: 10x3 - 5xa = 10x2
e) 58+ 4x4 - a x3 = 5x10.​

Answer 1

Explicație pas cu pas:

a)63+2×a=41+12

63+2×a=53

2×a=63-53

2×a=10

a=5

c)a×7+7+12=40

a×7=40-19

a×7=21

a=21÷7

a=3

d)10×3-5×a=20

30-5×a=20

5×a=30-20

5×a=10

a=10÷5

a=2

e)58+16-a×3=50

16-a×3=58-50

16-a×3=8

a×3=16-8

a×3=8