Question

Tính bằng 2 cách :

(25,5 - 17,15) \(\times\) 100

5 \(\times\) 67,35 \(\times\) 20

Answer 1

c1

(25,5 - 17,15)  100

=25,5x100-17,15x100

=2550-1715

=835

(25,5 - 17,15)  100

=8,35x100

=835

 

c1

5  67,35  20

=336,75x20

=6735

c2

5  67,35  20

=5x20x67,35

=100x67,35

=6735

Answer 2

a) \(\left(25,5-17,15\right)\times100\)

Cách 1:    \(\left(25,5-17,15\right)\times100=8,35\times100=835\)

Cách 2: \(\left(25,5-17,15\right)\times100=25,5\times100-17,15\times100=2550-1715=835\)

b)  \(5\times67,35\times20\)

Cách 1: \(5\times67,35\times20=336,75\times20=6735\)

Cách 2:  \(5\times67,35\times20=67,35\times\left(5\times20\right)=67,35\times100=6735\)

Answer 3

C1: (25,5-17,5) x 100

= 8 x 100

= 800

C2: (25,5-17,5) x 100

=25,5 x 100 - 17,5 x 100

= 2550 - 1750

= 800

C1: 5 x 67,35 x 20

= 67,35 x (5 x 20)

= 67,35 x 100

= 6735

C2: 5 x 67,35 x 20

=336,75 x 20

= 6735