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Решите уравнения
1)8(х-10)²-11(х+5)²=-3х²-170х+1600
2)2,5(4+х)²+7(5-х)(5+х)=295-4,5х²
3)1,9(у+20)(20-у)-1,6(у+20)²=116-3,5у²
4)30(1,8-у)²+20(у+1,8)(у-1,8)=50у²+140,4
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