а) М+(3ху-2у²)=х²+ху-у²
<span>(х</span>²<span>-2ху+у</span>²<span>)+(3ху-2у</span>²<span>)=х</span>²<span>+ху-у</span>²<span> </span>
<span> б) М-(4ху+3у</span>²<span>)= х</span>²<span>+ху-у</span><span>²</span>
<span>(х</span>²<span>+5ху+2у</span>²<span>)-(4ху+3у</span>²<span>)= х</span>²<span>+ху-у</span><span>²</span>
Ты с дальнего востока??
<span>решите уравнение 10(х-7)=-3(а+х)-23</span>
<span>10x-70=-3a-3x-23</span>
<span>10x+3a+3x=70-23</span>
<span>13x+3a=47</span>
x=(47-3a)/13