Ответ:
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В решении.
Объяснение:
1.
1) 7⁻⁵ * 49² =
=7⁻⁵ * (7²)² =
=7⁻⁵ * 7⁴ =
=1/7⁵ * 7⁴ =
= 7⁴/7⁵ = 1/7.
2) (1/2)¹⁸ : (1/2)²¹ =
= (1/2)¹⁸⁻²¹ =
= (1/2)⁻³ =
= 1 : (1/2)³ =
=1 : 1/8 = 8.
3) ((-0,3)²)⁻¹ = (0,09)⁻¹ = 1 : 0,09 = 1 : 9/100 = 100/9 = 11 и 1/9.
2.
1) 36х⁴b³ * (6xb⁻³)⁻² =
= 36х⁴b³ * 6⁻²x⁻²b⁶ =
= 36х⁴b³ * 1/6²* 1/x² *b⁶ =
= (36x⁴b³*b⁶)/36x² =
= 36х⁴b⁹/36x² =
= x²b⁹.
2) (6а/7b⁻¹)⁻² * (49a⁻²/18b⁻³)⁻¹ =
= (6⁻²a⁻²/7⁻²b²) * (49⁻¹a²/18⁻¹*b³)=
= (1/6²*1/a²) : (1/7²*b²) * (1/49*a²) : (1/18 *b³) =
= (1/36a²) : (b²/49) * (a²/49) : (b³/18) =
= (1 * 49)/(36a² * b²) * (a² * 18)/(49 * b³) =
= (49/36a²b²) * (18a²/49b³) =
= (49 * 18a²) /(36a²b² * 49b³) =
= 1/2b⁵ = 0,5b⁵.
3. (a - b)⁻² * (a⁻² - b⁻²) = -(a+b)/a²b²(a-b).
1) a⁻² - b⁻² = 1/a² - 1/b² = (b² - a²)/a²b² = (b-a)(b+a)/a²b²;
2) (a - b)⁻² = 1/(a-b)²;
3)1/(a-b)² * (b-a)(b+a)/a²b² = -(a-b)(a+b)/a²b²(a-b)² = -(a+b)/a²b²(a-b).
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Answers & Comments
Ответ:
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Ответ:
В решении.
Объяснение:
1.
1) 7⁻⁵ * 49² =
=7⁻⁵ * (7²)² =
=7⁻⁵ * 7⁴ =
=1/7⁵ * 7⁴ =
= 7⁴/7⁵ = 1/7.
2) (1/2)¹⁸ : (1/2)²¹ =
= (1/2)¹⁸⁻²¹ =
= (1/2)⁻³ =
= 1 : (1/2)³ =
=1 : 1/8 = 8.
3) ((-0,3)²)⁻¹ = (0,09)⁻¹ = 1 : 0,09 = 1 : 9/100 = 100/9 = 11 и 1/9.
2.
1) 36х⁴b³ * (6xb⁻³)⁻² =
= 36х⁴b³ * 6⁻²x⁻²b⁶ =
= 36х⁴b³ * 1/6²* 1/x² *b⁶ =
= (36x⁴b³*b⁶)/36x² =
= 36х⁴b⁹/36x² =
= x²b⁹.
2) (6а/7b⁻¹)⁻² * (49a⁻²/18b⁻³)⁻¹ =
= (6⁻²a⁻²/7⁻²b²) * (49⁻¹a²/18⁻¹*b³)=
= (1/6²*1/a²) : (1/7²*b²) * (1/49*a²) : (1/18 *b³) =
= (1/36a²) : (b²/49) * (a²/49) : (b³/18) =
= (1 * 49)/(36a² * b²) * (a² * 18)/(49 * b³) =
= (49/36a²b²) * (18a²/49b³) =
= (49 * 18a²) /(36a²b² * 49b³) =
= 1/2b⁵ = 0,5b⁵.
3. (a - b)⁻² * (a⁻² - b⁻²) = -(a+b)/a²b²(a-b).
1) a⁻² - b⁻² = 1/a² - 1/b² = (b² - a²)/a²b² = (b-a)(b+a)/a²b²;
2) (a - b)⁻² = 1/(a-b)²;
3)1/(a-b)² * (b-a)(b+a)/a²b² = -(a-b)(a+b)/a²b²(a-b)² = -(a+b)/a²b²(a-b).