0,8-4/5+7:21/24
1)7:21/24=24/3=8
2)0,8-4/5=4/5-4/5=0
3)0+8=8
<span>Ответ. 8
</span>
А) 7x³+5x²-4x-3x²-7x³+9 = 2x²-4x+9
б) 3p*5p/6 + 15p*4p²/5 - 9p²/2 + 2p*3/4 -3 + 2p³ = 15p²/6 - 9p²/2 + 12p³ + 2p³ + 3p/2 - 3 = 14p³ - 2p² + 1.5p - 3
51,(3) = (513 - 51)/9 = 462/9 = 154/3