Question

Afla numărul necunoscut:

{4x[(ax3:2-3x3):9+(4x2-2)]
+2x20}:20=20

Dau coroana și 10 puncte,rapid va rog!

Answer 1

Explicație pas cu pas:

4x[(ax3:2-3x3):9+(4x2-2)]

+2x20}:20=20

4x[(ax3:2-9):9+(8-2)]+40}:20=20

4x[(ax3:2-9):9+6]+40}=20 x20

4x[(ax3:2-9):9+6]+40}=400

[(ax3:2-9):9+6]+40}=400:4

[(ax3:2-9):9+6]+40}=100

[(ax3:2-9):9+6]=100 - 40

[(ax3:2-9):9+6]= 60

(ax3:2-9):9= 60-6

(ax3:2-9):9= 54

ax3:2-9= 54×9

ax3:2-9= 486

ax3:2= 486+9

a×3:2= 495

ax3= 495x2

ax3= 990

a= 990:3

a= 330

verificare:

4x[(330x3:2-3x3):9+(4x2-2)]+2x20}:20=20

4x[(990:2-9):9+(8-2)]+2x20}:20=20

4x[(495-9):9+6)]+40}:20=20

4x[486:9+6)]+40}:20=20

4x[54+6)]+40}:20=20

4x (60+40):20=20

4×100:20=20

4×5=20

20=20