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How to divide 18 by 2.5?
18÷2.5 =（18×4）÷（2.5×4） =72÷10 =7.2
Simple calculation 71.9 / 0.5 + 18.1 * 2 = 23.2 * 4 + 1.8 / 0.25 = how to calculate
71.9/0.5+18.1*2
= 71.9*2+18.1*2
=（71.9+18.1）*2
=90*2
=180
23.2*4+1.8/0.25
=23.2*4+1.8*4
=（23.2+1.8)*4
=25*4
=100
It is known that 5x & sup2; - 4xy + Y & sup2; - 2x + 1 = 0. Find the value of (X-Y) to the power of 2006
(4x²-4xy+y²)+(x²-2x+1)=0
(2x-y)²+(x-1)²=0
If the sum of the squares is 0, it is equal to 0
So 2x-y = 0, X-1 = 0
x=1,y=2x=2
x-y=-1
So the power of (X-Y) is 1
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