1) (5/7*7/3*5/6-1): (1-7/8*8/5*3/14)=(35/21*5/6-1):(1-56/40*3/14)=(175/126-1):(1-168/560)=(175/126-126/126): (560/560-168/560)=49/126:392/560=49*560/126*392=27440/49392= 1715/ 3087
2) (127/15-15/4+22/5-487/60): (17/4-11/4) =( 508/60-225/60+264/60-487/60):6/4=60/60: 6/4= 4/6=2/3
3) (21/13*13/42+40/7:8/21):(65/8+7/2)= (273/546+40*21/7*8):(65/8+28/8)=
(273/546+840/56):37/8= (273/546+8190/546):37/8= 8463/546 =155/10:37/8=155*8/370=1240/370=124/37=3 13/37
4) 13/5:91/15+15/14-112/73*(40/7-81/16)=
А)640/16-81/16=559/16
62608/1168=15652/292=3913 /73
195/455 + 3913/73= 14235 /33215+1780415/33215 =1794650/33215=54целых208/6643
Пошаговое объяснение:
1) 4x + 8 = 2x - 1 = 4x + 8 - 2x + 1 = 2x + 9, 2x = -9, x = -4,5.
2) 12 + y = -13 - 4y = 12 + y + 13 + 4y = 25 + 5y, 5y = -25, y = -5.
3) 8 + 3b = -7 - 2b = 8 + 3b + 7 + 2b = 10 + 5b, 5b = -10, b = -2.
4) -1,6 - 0,3p = 0,9p + 0,2 = -1,6 - 0,3p - 0,9p - 0,2, 1,2p = -1,8, p = -1,5.
5) 11/12x - 2/3 = -0,5 - 3/4x = 11/12x - 2/3 + 0,5 + 3/4x, 20/12x - 1/6, 20/12x = -1,6, x = -1/10.
6) 2a - (14 - 3a) = -10, 2a - 14 + 3a + 10, 5a = -4, a = -0,8.
7) 18 - 4y = 7(2 - y) + 6 = 18 - 4y = 14 - 7y + 6, 18 - 4y - 14 + 7y - 6, -2 = 3y, y = -2/3.
8) 3(-2z + 5) = 14 - 2(4z - 3) = -6z + 15 - 14 + 8z + 6, 2z = 7, z = 3,5.
9) 1,2d - 0,5(4d - 1) = -0,7(d - 2) = 1,2d - 2d + 0,5 + 0,7d - 1,4, -0,1d = -0,9, d = 9.
Пошаговое объяснение:
-8,4
-8 и 8
нет решения
-2 и 2
-3 и 3
нет решения