Răspuns :
Răspuns:
a)99-45:(6+3)+36
==>99-45:9+36
99-5+36
94+36=130
b)84:4×(72:9+5×5)-54:6
21×(8+25)-9
21×33-9
=693-9=684
c)(7+9)×(81:9)
16×9==>144
1. 99-45:(6+3)+ 36= 130
= 99-45:9+36
= 99-5+36
= 94 + 36
= 130
2. 84:4•( 72:9+5•5)-54:6= 684
= 21• ( 8+25 ) - 9
= 21• 33 -9
= 693-9
= 684
3. ( 7+9 ) • ( 81:9 )= 144
= 16 • 9
= 144
= 99-45:9+36
= 99-5+36
= 94 + 36
= 130
2. 84:4•( 72:9+5•5)-54:6= 684
= 21• ( 8+25 ) - 9
= 21• 33 -9
= 693-9
= 684
3. ( 7+9 ) • ( 81:9 )= 144
= 16 • 9
= 144