<span>Задание 1.
1)(3-а)(6-b)=18-3b-6a+ab
2)3a(5-b)=15a-3ab
3)8a(3a-4)(a-b)=8a(3a</span>²-3ab-4a+4b)=24a³-24a²b-32a²+32ab<span>
4)3x(y+5)(x-y)=3x(xy-y</span>²+5x-5y)=3x²y-3xy²+15x²-15xy<span>
5)8y(x-3)=8xy-24y
Задание 2.
1)(3x-2)²=9x</span>²-12x+4<span>
2)(3y+4)²=9y</span>²+24y+16<span>
3)(8a-3)²=64a</span>²-48a+9<span>
4)(5-4x)³=125-300x+240x</span>²-64x³<span>
5)(9+5y)³=729+1215y+675y</span>²+125y<span>
6)(4-8y)³=64-384y+768y</span>²-512y³
A3+а7=350
2а1+8d=350
a1+4d=175
S9=9/2×(2a1+8d)=9/2×350=175×9=1575
a5-a4=35
d=35
a1=35
a9=35+8×35=315
1. 2y - (y-3) = 6
2y - y + 3 = 6
y = 3
x = 0
2. 3x - (5-x) = 11
3x - 5 + x = 11
4x = 16
x = 4
y = 1