2.
1) (2c⁵d⁴+3c⁴d³) : (-3c⁴d³)= c⁴d³ (2cd+3) = - (2cd+3) = - ²/₃ cd -1
-3c⁴d³ 3
2) (-27k⁴ l⁵+21k³ l²) : (-10k³ l²)= k³ l² (-27k l³+21) = -27k l³ +21 =
-10k³ l² -10
= 2.7k l³ -2.1
3) (-a⁵b³ +3a⁶b²) : (4a⁴b²) = a⁴b²(-ab+3a²) = 3a² -ab
4a⁴b² 4
3.
1) (²/₃ by³ + ¹/₃ b²y²) : (³/₄ by²) = ¹/₃ by² (2y+b) * 4 = 4(2y+b)
3by² 9
2) (8b³y-2b²y²) : (2b²y)= 2b²y(4b-y) * 1 = 4b-y
2b²y
3) 4(2y+b) - (4b-y) = 8y+4b - 9(4b-y) = 8y+4b-36b+9y = 17y - 32b
9 9 9 9
4.
1) (3x³ +4x²y) : x² = x² (3x+4y) = 3x+4y
x²
2) (10xy+15y²) : (5y) = 5y(2x+3y) = 2x+3y
5y
3) 3x+4y -(2x+3y) = 3x+4y-2x-3y=x+y
При x=2, y= -5:
2-5= -3