Решите уравнение: -7/9 : 3, 1=х : 9, 3

- 7/9 : 3,1 = х : 9,3

3,1х = - 7/9 * 93/10

3,1х = - 651/90

х = - 651/90 : 31/10

х = - 651/90 * 10/31

х = - 21/9 = - 2 3/9 = - 2 1/3

х = - 2 1/3

Пошаговое объяснение:

А)(4×4 + 8×8) - 10 = (16 + 64) - 10 = 80 - 10 = 70.

(10×10 + 9×9) + 220 = (100 + 81) + 220 = 181 + 220 = 401

7х7 + 9х9 + 3х3 = 49 + 81 + 9 = 139

1 х (10х10 + 7х7) = 1 х (100+49) = 149

9×9 - 3×3 + 7×7 = 81 - 9 + 49 = 121

2×2 + (1000 - 9×9) = 4 + (1000 - 81) = 4 + 919 = 923

Б) 6х6 + (8×8 + 136) = 36 + (64 + 136) = 236

3×3 + (6×6 - 4×4) = 9 + (36 - 16) = 29

5×5 + 10×10 + 2 = 25 + 100 + 2 = 127

10×10 - (2×2 + 3×3) = 100 - (4 + 9) = 87

10 × (3×3 - 1×1) = 10 х (9 - 1) = 80

9×9 + (7×7 - 15) = 81 + (49 - 15) = 115

9/25

-8/27

-1,5

-2,4

3(1/5)

6

Пошаговое объяснение:

-3/5 × (-3/5) = (3×3)/(5×5) = 9/25

(-2/3) × (-2/3) × (-2/3) = -(2×2×2)/(3×3×3) = -8/27

2/7 × (-5(1/4)) = 2/7 × (-21/4) = -(2×21)/(7×4) = -(2×3×7)/(7×2×2) = -3/2 = -1,5

(-4/7) × 4,2 = (-4/7) × 4(2/10) = (-4/7) × 4(1/5) = (-4/7) × (21/5) = -(4×21)/(7×5) = -(4×3×7)/(7×5) = -(4×3)/5 = -12/5 = - 2(2/5) = -2(4/10) = -2,4

(-1(1/7)) × (-2,8) = (-8/7) × (-2(8/10)) = (-8/7) × (-2(4/5)) = (-8/7) × (-14/5) = (8×14)/(7×5) = (8×2×7)/(7×5) = (8×2)/5 = 16/5 = 3(1/5)

(-4(1/2)) × (-1(1/3)) = (-9/2) × (-4/3) = (9×4)/(2×3) = (3×3×2×2)/(2×3) = 3×2 = 6