X+3x=412
x=103
103*3=309
отв: 1 бак=309 литров,2 бак=103
Tg(7π-π/4)*(-sin(2π+π/6))-cos(10π+π/2)=-tgπ/4*(-sinπ/6)-cosπ/2=
=-1*(-1/2)-0=1/2
324÷18=18 *5=90 324-90=234 234÷26=9 *15=135 234-135=99
(0,133 − 0,283 / 0,16) − 0,12 × 0,28<span> = </span><span>−0,168603</span>