2.3+4b=3.5
4b=3.5-2.3
4b=1.2
b=1.2/4
b=0.3
8(2a+0.9)-2,2a=
16a+7.2-2.2a=
13.8a+7.2
13.8а=-7.2
а=-7.2/13.8
а≈-0.5 (сокращён до десятых)
216 : (16 - х) = 18 5у + 3(7у + 18) = 106
16 - х = 216 : 18 5у + 21у + 54 = 106
16 - х = 12 26у = 106 - 54
х = 16 - 12 26у = 52
х = 4 у = 52 : 26
у = 2
8х + 4(13х + 32) = 308 5(11х - 31) - 9х = 121
8х + 52х + 128 = 308 55х - 155 - 9х = 121
60х = 308 - 128 46х = 121 + 155
60х = 180 46х = 276
х = 180 : 60 х = 276 : 46
х = 3 х = 6
216 : (16 - х) = 18 5у + 3(7у + 18) = 106
16 - х = 216 : 18 5у + 21у + 54 = 106
16 - х = 12 26у = 106 - 54
х = 16 - 12 26у = 52
х = 4 у = 52 : 26
у = 2
8х + 4(13х + 32) = 308 5(11х - 31) - 9х = 121
8х + 52х + 128 = 308 55х - 155 - 9х = 121
60х = 308 - 128 46х = 121 + 155
60х = 180 46х = 276
х = 180 : 60 х = 276 : 46
х = 3 х = 6
2.3+4b=3.5
4b=3.5-2.3
4b=1.2
b=1.2/4
b=0.3
8(2a+0.9)-2,2a=16a+7.2-2.2a=
=13.8a+7.2