Question

afla numarul necunoscut 5+[16(9:a×8+7)]×6=4:(1×2)+3×3

Answer 1

Răspuns

Explicație pas cu pas:

5 + [ 16 - ( 9 : a × 8 + 7 ) ] × 6 = 4 : ( 1 × 2 ) + 3 × 3

5 + [ 16 - ( 9 : a × 8 + 7 ) ] × 6 = 4 : 2 + 9

5 + [ 16 - ( 9 : a × 8 + 7 ) ] × 6 = 2 + 9

5 + [ 16 - ( 9 : a × 8 + 7 ) ] × 6 = 11

[ 16 - ( 9 : a × 8 + 7 ) ] × 6 = 11 - 5

[ 16 - ( 9 : a × 8 + 7 ) ] × 6 = 6

16 - ( 9 : a × 8 + 7 ) = 6 : 6

16 - ( 9 : a × 8 + 7 ) = 1

9 : a × 8 + 7 = 16 - 1

9 : a × 8 + 7 = 15

9 : a × 8 = 15 - 7

9 : a  = 8 : 8

9 : a = 1

a = 9 : 1

a = 9 → numarul, aflat prin metoda mersului invers

Answer 2

[16-(9:a×8+7)]×6=4:(1×2)+3×3

[16-(9:a×8+7)]×6=4:2+3×3

[16-(9:a×8+7)]×6=2+9

[16-(9:a×8+7)]×6=11

[16-(9:a×8+7)]=11:6

16-(9:a×8+7)=1,8(3)+16

9:a×8+7=17,8(3)-7

9:a×8=10,8(3):8

9:a=1,35:9

a=0,15