$\left(2.3\right).7$
$9x-x$
$0+14+67+106$
$a^2-11a+107$
$x\:+8,\:para\:x=\:-6$
$1.\left(-4\right)$
$\int_{-2.843}^{0.908}\left(-0.85x^2-4x+6\right)-\left(0.7x^2-1x+2\right)dx$
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