<span>b3=3/4, q=-1/2</span>
<span>b3=b1*q^2</span>
<span>3/4=b1*1/4</span>
<span>b1=3</span>
<span>b2=-1.5</span>
<span>b4=-3/8</span>
<span>S=0.75+3-1.5-0.375=1.875</span>
Упростить выражение.......
<span>5a (4a + b)
</span><span>4 + ( 3 - 7 )
</span><span>6c - 2a </span>