tính nhanh : 98.2 + 96.4 + 961.8

= 98.2 + 961.8 + 96.4

=(98.2 + 961.8) + 96.4

=1060+96.4

=1256.4

Đổi 9h kém 15 = 8h45

Thời gian ô tô đi trên đường là : 

8h45p - 6h15p - 15p = 2h15p = 2,25h

Quãng đường ô tô đi từ HN -> HP là : 

2,25 x 48 = 108 ( km )

D/s :...

A = 1\(\dfrac{1}{9}\).1\(\dfrac{1}{10}\).1\(\dfrac{1}{11}\)..........1\(\dfrac{1}{2021}\)

A = \(\dfrac{10}{9}\).\(\dfrac{11}{10}\).\(\dfrac{12}{11}\).\(\dfrac{13}{12}\)...........\(\dfrac{2022}{2021}\)

A = \(\dfrac{2022}{9}\)

A = \(\dfrac{674}{3}\)

tui dang gap

Tổng độ dài `2` đáy :

`225 xx 2 : 15 = 30(cm)`

Độ dài đáy lớn :

`(30+6)/2 = 18(cm)`

Độ dài đáy bé:

`18-6=12(cm)`

Đ/s...

`#H.J`

0123

x< \(\dfrac{2003}{612}\) < y

x < 3 + \(\dfrac{167}{612}\) < y

⇔ x < 4 < y

⇔ x = 3 , y = 5

c.150 nha b

A.204

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D,1332 nhé