Question

упростить выражение 109t-(91t+7(t-10(t-z)))-11z

Answer 1

$109t-(91t+7(t-10(t-z)))-11z=109t-(91t+7(t-10t+10z))-$$-11z=109t-(91t+7(-9t+10z))-11z=$$=109t-(91t-63t+70z)-11z=109t-(91t-63t+70z)-11z=$$=109t-(28t+70z)-11z=109t-28t-70z-11z=81t-81z$