Xiao Gang is 140 cm tall. Xiao Gang is 27 times higher than Xiao Ming. How many cm is Xiao Ming?

Xiao Gang is 140 cm tall. Xiao Gang is 27 times higher than Xiao Ming. How many cm is Xiao Ming?

Xiao Ming is 135 cm tall

I know Xiaoqiang's height is 143 cm. Xiaoming's height is 136 cm. What's Xiaogang's height? Is the known average height 139 cm?

138

2.7 + 0.3 = 1-0.06 = 0.6-0.47 = 10-0.3 = 0.8 + 4.7 = 5.63-0.6 = 0.75 × 100 = 5.6 △ 100 × 10=

2.7+0.3=3 1-0.06=0.94 0.6-0.47=0.13 10-0.3=9.7 0.8+4.7=5.5 5.63-0.6=5.03 0.75×100=75 5.6÷100×10=0.56

How to simplify radical 500

√500=√(5X100)=10√5
This is the simplest form of simplification, that is to put the complete square factor part of the root sign outside the root sign

A school held a sports meeting and planned to give each of 1991 students a bottle of soda. Because the store stipulated that every seven empty bottles could be replaced with one bottle of soda, it was not necessary to buy 1991 bottles of soda, but at least how many bottles of soda should I buy?

If you don't buy 1991 bottles, you can change them: 1991 △ 7 = 284 3 (bottle); 1991-284 = 1707 (bottle), if you buy first, if you buy 1707 bottles of soda, 1707 △ 7 = 243 6 (bottles), 243 bottles of soda can be changed; (243 + 6) △ 7 = 35 (bottle), 35 bottles of soda can be changed; (35 + 4) △ 7 = 54, 5 bottles of soda can be changed

Factorization of Y quartic-8y square-9a square + 6ac-16c square

y^4-8y²-9
=(y²-9)(y²+1)
=(y+3)(y-3)(y²+1)
a²+6ac-16c²
=(a+8c)(a-2c)

Xiao Li and some children went to the fast food restaurant for dinner. They bought 10 hamburgers and French fries at a total cost of 84 yuan. They bought several hamburgers and French fries each
Hamburgers are 10 yuan each and French fries are 6 yuan each

She bought x hamburgers and Y French fries
According to the meaning of the title: 10x + 6y = 84
X+Y=10②
X=10—Y③
Substituting 3 into 1, 10 (10-y) + 6y = 84
100-10Y+6Y=84
-4Y=-16
Y=4
Then x = 6
A: I bought 6 hamburgers and 10 French fries

A (a + 4b) - (a + 2b) (a-2b) where AB satisfies the condition a ^ 2 + 2Ab + B ^ 2 = 0

Use the complete square formula
That is, a & # 178; + 2Ab + B & # 178; = (a + b) &# 178; = 0, so a + B = 0
a(a+4b)-(a+2b)(a-2b) = a²+4ab-a²+4b²= 4b(a+b) = 0

The distance between a and B is 200 kilometers. Car a goes from place a to place B for 40 kilometers per hour. After car a goes for 1.5 hours, car B goes from place B to place a

2004 out of 2005 times 2004

2004/2005*2004
=2004/2005*（2005-1）
=2004/2005*2005-2004/2005*1
=2004-2004/2005
=2003 and 1 / 2005