0.2х+0.3у=1.2 (*2)
0.5х-0.6y=0.3
0.4х+0.6у=2.4
0.5х-0.6у=0.3
0.9х=2.7
х=3
0.5х-0.6у=0.3
0.5*3-0.6y=0.3
1.5-0.6y=0.3
-0.6y=-1.2
y=2
x=3 y=2
Cos765=cos(720+45)=cos45=√2/2
sin19π/6=sin(3π+π/6)=sin(π+π/6)=-sinπ/6=-1/2
<span>а) (3х²)³ = 9х<u>6ст</u></span>
<span><span>в) (-2а4степ. b²)³=-8а<u><em>12ст</em></u>б<u>6ст</u></span></span>
<span><span><span>д) (-а²bc³ )5степ.=-а<u>10ст </u>б<u>5ст </u>с<u>15ст</u></span></span></span>
<span><span><span><u>
</u><u /><span> б) (4m)²=16m<u>2ст</u></span></span></span></span>
<span><span><span><span> г) (-3x²y) 4степ=81х<u>8ст</u>у<u>4ст</u></span></span></span></span>
<span><span><span><span><u>
</u><span> е) (-a³b²c)² 484.=-а<u>ст1452</u> б<u>ст968</u> с<u>ст968</u></span></span></span></span></span>