Answer:
2
Step-by-step explanation:
x÷3 dư 1-->x=3a+1
y÷3 dư 2-->y=3b+2
x×y=(3a+1)×(3b+2)
=9ab+6a+3b+2
Mà 9ab, 6a, 3b chia hết cho 3, 2 chia 3 dư 1
==>x×y chia 3 dư 2
Answer:
27
Step-by-step explanation:
Use exponent laws
1/3^-3 = 3^3 = 27
Width = 70yd
Length = 105yg
2(65+110) = 2(70+105)
But 65*110 = 7150
And 70*105 = 7350
So 70*105 > 65*110
X = -b/2a
x = -8/4
x = -2
Plug -2 in for x and solve for y
y = 2(-2)^2 + 8(-2) -3
y = 8 -16 -3
y = -11
Vertex (-2, -11)
