Решите уравнения
2)(1-у)^3+8у=7+у^2 (3-у)
3)(х+1)^3+(х-1)^3-2х^3=12
4)(1+у)^3+(1-у)^3-6у^2=3у-1
2)(1-у)^3+8у=7+у^2 (3-у)
3)(х+1)^3+(х-1)^3-2х^3=12
4)(1+у)^3+(1-у)^3-6у^2=3у-1
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Answers & Comments
2) 1-3у+3у²-у³+8у=7+3у²-у³
1-3у+8у=7
1+5у=7
5у=7-1
5у=6
у=6/5 или 1,2
3) х³+3х²+3х+1+х³-3х²+3х-1-2х³=12
0+6х=12
6х=12
х=2
4) 1+3у+3у²+у³+1-3у+3у²-у³-6у²=3у-1
1+3у²+1-3у+3у²-6у²= -1
2+0-3у= -1
2-3у = -1
-3у= -1-2
-3у= -3
у= 1