b: =100x1000=100000

a)=\(\left[72.\left(-2\right)\right].\left[-50.\left(-2\right)\right]\)

=-144.100

=-14400

b)=(125.8).(-5).(-20)

=1000.100

=100000

c)=\(\left[125.\left(-4\right)\right]\).(-3).(-32)

=-500.96

=-48000

d)=-492.125

=-60500

15

694

357

67

35

369

15
694
67
35
369

1+2+3+4+5=15
123+571=694
109+248=357
190-123=67
187-152=35
123+246=369

Tính nhanh:

 1+2+3+4+5+6+7+8+9+10

=(1+9)+(2+8)+(3+7)+(4+6)+10+5

=  10  +  10  +  10   + 10  + 10+5

=             50   +   5

=    55

123*45+123*50+123*5

=  123*(45+50+5)

=   123 * 100

=   12300

K mk nha bn

1+2+3+4+5+6+7+8+9+10

= ( 1+10 ) + ( 2+9) + (3+8) + (4+7) + (5+6)

=     11    +      11   +   11    +   11  +    11

=11 x 5 

=55

123 x 45 + 123 x 50 + 123 x 5 

= 123 x ( 45 + 50 +5 )

= 123 x 100

=12300

hok tốt .

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 10 : 2 x 11 = 55

123 x 45 + 123 x 50 + 123 x 5 = 123x ( 45 + 50 + 5) = 123 x 100 = 12300

\(=123\times\left(4+1+1\right)=123\times6=738\)

=123x6

=738

=132+13.123+123123

=132+1599+123123

=124854

13854

= 132+123x13+123123
=132+1599+123123
=1731+123123
=124854
 

=123 x 10 

= 1230

Ai tốt bụng thì tk cho mk nha, mik đg bị âm điểm nè

=123*10

=1230 nha bạn!

123+123+123+123+123+123+123+123+123+123

=123*10

=1230

123 x 4 + 123 x 6 + 123 x 9 + 123

= 123 x 4 + 123 x 6 + 123 x 9 + 123 x 1

= 123 x (4 + 6 + 9 + 1)

= 123 x 20

= 2460

Đáp số : 2460

123 x 4 + 123 x 6 + 123 x 9 +123
= 123 x 4 + 123 x 6 + 123 x 9 +123 x 1
= 123 x (4 + 6 + 9 + 1)
= 123 x 20
= 2460

123x4 +123x6 +123x9 +123

=123 x4 +123x6+ 123x9 +123 x1

=123x (4+6+9+1)

=123x 20

=2460

15620

\(123+123+123+123+123\cdot123-\frac{123}{123}\)

\(=4\cdot123+15129-1\)

\(=15620\)

123+123+123+123  =  123+123+123+123

123+123++123+123=123+123+123+123

......la dau =