Ta có: 0,15x400

=0,15 x 4 x 100= 0,6 x 100=60

0,15 x 400 = 0,15 x 100 x 4 

                  = 15 x 4

                   = 60

\(=9,8\times\left(125,2-25,2\right)=9,8\times100=980\)

9,8 x 125,2 - 25,2 x 9,8

=9,8x[125,2-25,2]

=9,8x 100=980

9,8 x 125,2 - 25,2 x 9,8

= 9,8 x (125,2 - 25,2)

= 9,8 x 100

= 980

Học tốt nhé.

\(7,28\div0,25+7,28\times5+7,28\)

\(=7,28\times4+7,28\times5+7,28\times1\)

\(=7,28\times\left(4+5+1\right)\)

\(=7,28\times10\)

\(=72,8\)

a, 20,18 x 7,5 + 20,18 + 20,18 + 20,18 : 2

= 20,18 x 7,5 + 20,18 x 1 + 20,18 x 1 + 20,18 x 0,5

= 20,18 x ( 7,5 + 1 + 1 + 0,5)

= 20,18 x 10

= 201,8 

b, 100 : 9   - 79,3 : 9

= (100 - 79,3) : 9

= 20,7 : 9

= 2,3

=202(24+14-27)=202*11=2222

\(202\times24+20,2\times140-2,02\times2700\\ =202\times24+202\times14-202\times27\\ =202\times\left(24+14-27\right)\\ =202\times11\\ =2222\)

\(20,22\times18,6+20,22\times0,394+40,4\times21\)

\(=20,22\times\left(18,6+0,394\right)+40,4\times21\)

\(\approx384,06+848,4=1232,46\)

12345678900976543234567890987654321234567899999999998765x

12345678900987654325678909876543234567899876234567890999

giúp mình nhé

75,38*104-75,38/0,125+75,38/0,25
7839,52-75,38/0,125+75,38/0,25
7839,52-603,04+75,38/0,25
7839,52-603,04+301,52
Tính phép cộng hoặc phép trừ từ trái sang phải.
7839,52-603,04+301,52
7236,48+301,52
7538
HỌC TỐT NHA

 

\(=25,17\times\left(16,9-16,8\right)\\ =25,17\times1=25,17\)

25,17 x 16,9 - 25,17 x 16,8 

= 25,17 x ( 16,9 - 16,8 )

= 25,17 x 0,1

= 2,517

25,17 x 16,9 - 25,17 x 16,8

=25.17 x(16.9 - 16.8)

=25.17 x 0.1

=2.517