23х=59+10
23х=69
х=69 : 23
х=3
Проверка:
22*3+3-10=59
66+3-10=59
59=59
1) 21-(5-8) = 21 - (-3) = 21 + 3 = 24
2) 3,7-(4-5,3) = 3,7 - (-1,3) = 3,7 + 1,3 = 5
3) -13-(20-32) = -13 - (-12) = -13 + 12 = -1
4) -4,5-(7-9,5) = -4,5 - (-2,5) = -4,5 + 2,5 = -2
5) -18-(9-5) = -18 - 4 = -22
6) -0,25-(3-2,25) = -0,25 - 0,75 = -1
Х(2/3 -1/6 +8/9)=х(12-3+16)/18=х*25/18=1целая 7/18х
15 * (78 : 13) - х = 76
15 * 6 - х = 76
90 - х = 76
х = 90 - 76
х = 14