1) упростит выражение:
[tex](4x - 7) {}^{2} + (3x - 7)(3x + 7) + 68x[/tex]
[tex](4x - 7) {}^{2} + (3x - 7)(3x + 7) + 68x[/tex]
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(16х²-56х+49)+(9х²-42х+49)+68х=25х²-98х+98+68х=25х²-30х+98