Xiao Hong wrote to her mother, asking her to buy her a suit of clothes

Xiao Hong wrote to her mother, asking her to buy her a suit of clothes

Xiao Hong wrote to her mother, asking her to buy a suit for herself
Xiao Hong wrote to her mother, asking her mother to buy her a suit of clothes

My mother is about 40 years old. Spring is coming. All kinds of flowers and plants are blooming!

My mother is about 40 years old
Spring is coming, all kinds of flowers are blooming

When 2a2b-6ab2 decomposes a factor, the common factor to be extracted is______ ．

If the factorization of polynomial 2a2b-6ab2, the common factor 2Ab should be proposed

(1) How many grams of water and 49G of sulfuric acid contain the same mass of hydrogen
(1) What is the mass ratio of sulfur dioxide to sulfur trioxide in order to make sulfur dioxide and sulfur trioxide contain the same mass of oxygen?

The molecular weight of 9 g of water is 18, the molecular weight of sulfuric acid is 98, 49 g of sulfuric acid contains 1 mol of hydrogen, and 9 g of water contains 1 mol of hydrogen
The molecular weight of sulfur dioxide is 64, the oxygen content is 32 / 64, the molecular weight of sulfur trioxide is 80, and the oxygen content is 48 / 80
The mass ratio is 48 / 80:32 / 64 = 6:5

([{M-N} of {square of m-2mn + n}] - {[square of M-N]}) of [Mn + n square]
([{M-N} of {m2-2mn + n}] - {[m2-n]}) of [Mn + n] multiplied by {mn-1]}

The title is ({M-N} - {M-N}) divided by {N-M}

2.5 * 4.8 three simple calculation methods

　　2.5*4.8　　=(2.5*4)*(4.8/4)=10*1.2=122.5*4.8　　=2.5*(4*1.2)　　=2.5*4*1.2　　=10*1.2　　=12　　2.5*4.8　　=2.5*(4+0.8)　　=2.5*4+2.5*0.8　　=10+2　　=12　　2.5*4.8　　=2.5*(5-0.2)　　=2.5*5-2.5*0...

Simple calculation: 11-8 / 12 + 1-8 / 12

11 / 12-1 / 8 + 1 / 12-1 / 8
=11 / 12 + 1 / 12-1 / 8-1 / 8
=1-1 / 4
=3 / 4

2005 times of 2-2004 times of 2-2003 times of 2-1

=2004 times of 2-2003 times of 2-1
=1

It is known that a = 0.09, B = 1 / 10 and 178; + 1 / 11 and 178; + 1 / 12 and 178; + +1 / 100, C = 0.11?

Because, 1 / (10 × 11) + 1 / (11 × 12) + 1 / (12 × 13) + +1/(100×101)

How to do 4.25 minus 3 and 5 out of 6 (2 and 1 out of 6 minus 1 and 3 out of 4) in a simple way

Original formula = 4 1 / 4-1 3 / 4 - (3 5 / 6 + 2 1 / 6) = 2 1 / 2-6 = - 3 1 / 2