1)Докажите что выражение приобретает только неотъемлемых значений:

х^2+2x+1=

2)Докажите что значение выражения делится на данное число:

245^2-236^2 на 9

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Решите систему уравнений: 1.х^2-2у-5=0

                                                         3у-6=0

                                                      2.2х+8=0

                                                         y^2+ху+4=0

0.7:25= 7.9:316= 9.6о7:10= 14.706:1000= 0.0142:100= 0.75:10000=