Given A-B = 2, B-C = 1, find the value of the algebraic formula A ^ 2 + B ^ 2 + C ^ 2-ab-bc-ac

Given A-B = 2, B-C = 1, find the value of the algebraic formula A ^ 2 + B ^ 2 + C ^ 2-ab-bc-ac

a-b=2,b-c=1
a-c=3
a^2+b^2+c-ab-bc-ac
=1/2[(a-b)^2+(b-c)^2+(a-c)^2]
=1/2[4+1+9]
=7

Xiaoxiao went to the supermarket to buy some of the same cola and the same mineral water, and just paid 60 yuan. It is known that each bottle of cola costs 4 yuan, and each bottle of mineral water costs 3 yuan. Xiaopang has to buy both kinds of drinks, with a maximum of 10 yuan______ There are two different ways to buy

Buy 3 bottles of coke, 16 bottles of mineral water, 3 × 4 + 16 × 3 = 60 yuan; buy 6 bottles of coke, 12 bottles of mineral water, 6 × 4 + 12 × 3 = 60 yuan; buy 9 bottles of coke, 8 bottles of mineral water, 9 × 4 + 8 × 3 = 60 yuan; buy 12 bottles of coke, 4 bottles of mineral water, 12 × 4 + 4 × 3 = 60 yuan

2006 × 2008208-2008 × 20062005 urgent

2006×20082008-2008×20062005
=2006x2008 x1001-2008x20062005
=2008x(2006x1001-20062005)
=2008x(20062006-20062005)
=2008x1
=2008
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There are 27 people going to buy Coke. If you buy three cans, you can get one free. How many can you buy to make all 27 people drink coke

27×（1-1/3）
=27×2/3
=18 cans

What is the minus 2 power of minus 3?

=1 / 2 of minus 3 = 1 / 9

The distance between a and B is 240 kilometers. A bus takes 2 hours to travel 5 / 3 of the whole journey. According to this calculation, how many hours will it take for the rest of the journey to complete?

Good!
Two hours, five-thirds of the way,
240*(5/3)=144(km)
144÷2=72(km/h)
240-144=96(km)
96÷72=3/4(h)

1 * 2 / 2005 + 2 * 3 / 2005 + 3 * 4 / 2005 + 4 * 5 / 2005 +. + 2004 * 2005 / 2005 = how much?

2005*(1/(1*2) + 1/(2*3) + .+ 1/(2004*2005))
= 2005*(1 - 1/2 + 1/2 - 1/3 + .+ 1/2005)
= 2005*(1 - 1/2005)
= 2005 - 1
= 2004

The two vehicles run from two places with a distance of 360km at the same time. They meet in 5 hours. Vehicle a runs x kilometers per hour and vehicle B runs 40 kilometers per hour
Equivalent relation ()
Equation ()

Equivalent relation (distance between a and B and distance between two places)
Equation (5x + 40x5 = 360)

Given that the solution of equation 2x + 5 = 7 is the same as that of equation 2x-a = 6, then a =?
There are 43 people in team a and 25 people in team B. now x people are transferred from team B to team a, making the number of team a three times that of team B. Lie equation

2X+5=7
2X=7-5
2X=2
X=1
2 x-a = 6
2-a=6
-a=6-2
a=-4
43+x=3(25-x)
43+x=75-3x
4x=75-43
4x=32
x=8

Two cars a and B drive from two places 240 kilometers apart at the same time, and meet each other in 1.5 hours. It is known that the speed ratio of car a and car B is 5:3, and how many kilometers does car B travel per hour

Let B's speed be unknown, and use their ratio instead of a's speed. Because they are relative, we use speed times time equal to distance to calculate
x*1.5+3/5x*1.5=240