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LyonLyon
@LyonLyon
December 2019
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Ajudem pf...
(x+5)²-(4-x)²
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lelunardi1
(x+5)²-(4-x)² =
(x² + 2.x.5 + 5²) - (4² - 2.4.x. + x²) =
x² +10x +25 -16 +8x - x² =
x² -x² +10x +8x +25 -16 = x² se cancela com -x²
18x = -25 +16
x = -9 / 18
x = -1/2
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(x² + 2.x.5 + 5²) - (4² - 2.4.x. + x²) =
x² +10x +25 -16 +8x - x² =
x² -x² +10x +8x +25 -16 = x² se cancela com -x²
18x = -25 +16
x = -9 / 18
x = -1/2