👤

a=9x81x3la a doua : 27 x 9:3-9x3la a patra

Răspuns :

a = 9×81×3^2 : 27×9:3 - 9×3^4
a = 729×9 : 27 × 3 - 9×81
a = 6561 : 27 × 3 - 729
a = 243 ×3 - 729
a = 729 - 729
a = 0