Răspuns: [tex]\bf \red{\underline{-63}}[/tex]
Explicație pas cu pas:
21⁴⁵ : (-3)⁴³ : (-7)⁴⁴ =
21⁴⁵ : (-3)⁴³ : 7⁴⁴ =
[7⁴⁵ · 3⁴⁵] : (-3)⁴³ : (-7)⁴⁴ =
- [7⁴⁵ · 3⁴⁵⁻⁴³] : 7⁴⁴ =
-(7⁴⁵· 3²) : 7⁴⁴=
-7¹ · 3² = - 7 · 9 = - 63
sau
[tex]\bf 21^{45}:(-3)^{43}:(-7)^{44} = \dfrac{21^{45}}{(-3)^{43}} :(-7)^{44} =[/tex]
[tex]\bf -\dfrac{21^{45}}{3^{43}} :7^{44} =-\dfrac{3^{45}\cdot 7^{45}}{3^{43}} :7^{44} =[/tex]
[tex]\bf -\dfrac{\not3^{45}\cdot 7^{45}}{\not3^{43}} :7^{44} =-3^{2}\cdot 7^{45}:7^{44} =[/tex]
[tex]\bf -3^{2}\cdot 7^{45-44} =-9\cdot 7^{1} =[/tex]
[tex]\bf \red{\underline{-63}}[/tex]
==pav38==
Mult succes !
