Пошаговое объяснение:
(99/8 ×16/33 -5 5/21)×7/8 +3 2/15=(3×2-5 5/21)×7/8 +3 2/15=(5 21/21 -5 5/21)×7/8 +3 2/15=16/21 ×7/8 +3 2/15=2/3 +3 2/15=10/15 +3 2/15=3 12/15=3 4/5=3,8
(27/4 ×2/9 +2 5/7)×7/59 -2/5=(3/2 +2 5/7)×7/59 -2/5=(21/14 +2 10/14)×7/59 -2/5=59/14 ×7/59 -2/5=1/2 -2/5=0,5-0,4=0,1
(1 9/21 +4 5/21 -5 1/4)×12/7 +3 1/7=(5 2/3 -5 1/4)×12/7 +3 1/7=(8/12 -3/12)×12/7 +3 1/7=5/7 +3 1/7=3 6/7
1/3 ×(32/15 ×25/4 -16/3 ×9/8)=1/3 ×(8×5/3 -2×3)=1/3 ×(40/3 -18/3)=1/3 ×22/3=22/9=2 4/9
9/5 ×(12 21/36 -9 19/36) -17/35 ×45/34=9/5 ×55/18 -9/14=77/14 -9/14=68/14=34/7=4 6/7
77/12 +23/12 -3 1/3=25/3 -10/3=15/3=5
(8×3/5 +1/5)×3/8=25/5 ×3/8=5×3/8=15/8=1 7/8
(3 3/12 +2 2/12)×5/13 -2/3 ×9/4=65/12 ×5/13 -3/2=5×5/12 -18/12=25/12 -18/12=7/12
(3 1/4 +7/6 ×9/14)×7/16 +2/3=(3 1/4 +3/(2×2))×7/16 +2/3=4×7/16 +2/3=7/4 +8/12=1 9/12 +8/12=2 5/12
(135/252 -77/252)×21/29 +48/7 ×21/16=29/126 ×21/29 +3×3=1/6 +9=9 1/6
20. 18. 1. 15. 19. 17. 16. 18. 20. 10. 18. 16. 3. 12. 1.
Ответ:
1)3288,6
2)929
3) -71,5
Пошаговое объяснение:1)27 * 2194 / 18 - 64 / 27 = 59238 / 18 - 2,4 = 3291 - 2,4 = 3288,6
2)27 * 1876 / 54 - 243 / 27 = 50652 / 54 - 9 = 938-9 = 929
3)8 - 2032 / 32 - 256 / 16 = 8- 63,5 - 16= -55,5 - 16 = -71,5
1. (n - 46) - 78 = 77
n - 46 - 78 = 77
n = 77 + 78 + 46
n = 201
2. А) 258 - 77 - 43 = 138
Задуманное число 138
Б) 258 + 77 - 43 = 291
Задуманное число 291
В) 258 + 77 + 43 = 378
Задуманное число 378
3. (х + 43) - 77 = 258 (х + 43) + 77 = 258 (х- 43) - 77 = 258
х + 43 - 77 = 258 х + 43 + 77 = 258 х - 43 - 77 = 258
х = 258 - 43 + 77 х = 258 - 43 - 77 х = 258 + 43 + 77
х = 291 х = 138 х = 378
