Số tiền mà mẹ Lan đã mua là:

     $24$ $500$ . $2$ + $21$ $000$ . $5=154$ $000$ (đồng)

Số tiền còn lại của Mẹ Lan sau khi mua là:

     $160$ $000-154$ $000=6$ $000$ (đồng).

a) 67. 36 + 67. 65 - 67. 1

=67. ( 36+ 65+ 1)

=67. 100

=6700

b) (7²³. 45 + 7²³. 4) : 7²⁵

= 7²³.( 45 + 4) : 7²⁵

=7²³. 49 :7²⁵

= 7²³. 7²: 7²⁵

= 7²⁵ : 7²⁵

=7

a) 67. 36 + 67. 65 - 67. 1

=67. ( 36+ 65+ 1)

=67. 100

=6700

b) (7²³. 45 + 7²³. 4) : 7²⁵

= 7²³.( 45 + 4) : 7²⁵

=7²³. 49 :7²⁵

= 7²³. 7²: 7²⁵

= 7²⁵ : 7²⁵

=7

a) VI ; XXIV ; XXXIX

b) Ư(36) = { 9; 12; 18; 36} 

Today I'm here to introduce my mother. Now she is about 40 years old but she looks younger than her age, everyone in my neighbor, also my friend usually say she like that. She is shorter than me but she isn't fat, her face and her eyes are round but that make she more beautiful, I don't know; my mother is old, she is 40 years old and every one mistakenly thought I was her mom!!!!!!! She is tender with every one without me, she is strict, too??? I very love she because she is my mom.

Today I'm here to introduce my mother. Now she is about 40 years old but she looks younger than her age, everyone in my neighbor, also my friend usually say she like that. She is shorter than me but she isn't fat, her face and her eyes are round but that make she more beautiful, I don't know; my mother is old, she is 40 years old and every one mistakenly thought I was her mom!!!!!!! She is tender with every one without me, she is strict, too??? I very love she because she is my mom.

Today I'm here to introduce my mother. Now she is about 40 years old but she looks younger than her age, everyone in my neighbor, also my friend usually say she like that. She is shorter than me but she isn't fat, her face and her eyes are round but that make she more beautiful, I don't know; my mother is old, she is 40 years old and every one mistakenly thought I was her mom!!!!!!! She is tender with every one without me, she is strict, too??? I very love she because she is my mom.

Today I'm here to introduce my mother. Now she is about 40 years old but she looks younger than her age, everyone in my neighbor, also my friend usually say she like that. She is shorter than me but she isn't fat, her face and her eyes are round but that make she more beautiful, I don't know; my mother is old, she is 40 years old and every one mistakenly thought I was her mom!!!!!!! She is tender with every one without me, she is strict, too??? I very love she because she is my mom.

Today I'm here to introduce my mother. Now she is about 40 years old but she looks younger than her age, everyone in my neighbor, also my friend usually say she like that. She is shorter than me but she isn't fat, her face and her eyes are round but that make she more beautiful, I don't know; my mother is old, she is 40 years old and every one mistakenly thought I was her mom!!!!!!! She is tender with every one without me, she is strict, too??? I very love she because she is my mom.

Today I'm here to introduce my mother. Now she is about 40 years old but she looks younger than her age, everyone in my neighbor, also my friend usually say she like that. She is shorter than me but she isn't fat, her face and her eyes are round but that make she more beautiful, I don't know; my mother is old, she is 40 years old and every one mistakenly thought I was her mom!!!!!!! She is tender with every one without me, she is strict, too??? I very love she because she is my mom.