Question

[赵丽颖]

1.tính nhanh

a)(56* 2,7+56*3,5)/0,62

b)371*65+371*14+629*79

c)0,48*700-2,4**45*2

d)13,5*5,1+4.,5*1+4,5*7,8*3+12,9*6,5

e)3,2*950+8*175*4+320*73

Answer 1

[Hắc Hường]

Giải:

a) \(\dfrac{56.2,7+56.3,5}{0,62}\)

\(=\dfrac{56.6,2}{0,62}\)

\(=56.10=560\)

b) \(371.65+371.14+629.79\)

\(=371\left(65+14\right)+629.79\)

\(=371.79+629.79\)

\(=79\left(371+629\right)\)

\(=79.1000=79000\)

c) \(0,48.700-2,4.45.2\)

\(=4,8.70-4,8.45\)

\(=4,8\left(70-45\right)\)

\(=4,8.25=120\)

e) \(3,2.950+8.175.4+320.73\)

\(=32.95+32.175+32.730\)

\(=32\left(95+175+730\right)\)

\(=32.1000=32000\)

Vậy ...

Answer 2

[Duong Minh Triet]

Giải:

a)

b)

c)

e)