Question

Tính nhanh:

a. 125 x 25 x 8 x 4                                              b.   25 x 32 x 125  x 15

= (

Answer 1

a) \(125\times25\times8\times4\)
\(\Rightarrow\left(125\times8\right)\times\left(25\times4\right)\)
\(\Rightarrow1000\times100\)
\(\Rightarrow100000\)

Answer 2

\(\text{a. 125 x 25 x 8 x 4 }\\ =125.8.25.4\\ =1000.100=100000\)

\(\text{ b. 25 x 32 x 125 x 15}\\ =25.15.32.125\\ =375.4000=1500000\)

 

Answer 3

b.25 x 32 x 125 x 15=25 x 4 x 8 x 125 x 15

                                =(25 x 4) x (125 x 8) x15

                                =100 x 1000 x 15 = 1500000

Answer 4

a)

\(=\left(25X4\right)X\left(125X8\right)\)

\(=100X1000\)

\(=\text{100000}\)

b)

\(=\left(32X125\right)X\left(25X15\right)\)

\(=4000X375\)

\(=15\text{00000}\)