1052.
2) 8 1/8 +1 1/3 - 3 1/4 = 8 3/24 +1 8/24 - 3 6/24 = 6 5/24
4) 5 2/3 + 2 1/4 - 1 1/5 = 5 40/60 + 2 15/60 - 1 12/60 = 6 43/60
6) 12 7/15 - 9 3/4 + 5 11/12 = 12 28/60 - 9 45/60 + 5 55/60 =
=11 88/60 - 9 45/60 + 5 55/60 = 7 98/60 = 8 38/60
1053
2) 5 2/7 - 1/3 + 6 = 5 6/21 - 7/21 + 6 = 4 27/21 - 7/21 + 6 = 10 20/21
4) 3 5/12 - 4/5 + 31/60 = 3 25/60 - 48/60 + 31/60 = 2 85/60 - 48/60 + 31/60 =
= 2 68/60 = 3 8/60 = 3 2/15
6) 8 7/15 - 5 3/4 + 6 = 8 28/60 - 5 45/60 + 6 = 8 88/60 - 5 45/60 + 6 = 9 43/60
3x² -2x -5 =0
D =b² -4ac,
(a=3, b= -2, c= -5)
D =4 +4*3*5 =64 =8²
x1,x2=(-b+-корень изD)/2a
x1 =(2 -8)/6 = -1
x2 =(2 +8)/6 =5/3=1 2/3(одна целая две третьих) ответ: x= -1, x =1 2/3
(42-33)×6=9×6=54
(29+34)÷9=63:9=7
(45+16)-(45-16)=61-29=32
(56:7):4=8:4=2
(100-36)-(18-2)=64-9=55
Ответ:
Пошаговое объяснение:
(2x - 6)* (6 -2x) = 2x*6 + 2x*(-2x) - 6*6 - 6*(-2) = 12x -4x^2 -36 +12x = 24x - 4x^2 -36