a) 652 + 327 + 148 + 73 = ( 652 + 148) +( 327+73) = 800+400 =1200

 b) 19 x 16 x 4 + 76 x 34 = ( 19 x 4 ) x 16 + 76 x 34 = 76 x 16 + 76 x 34 = 76 x( 16+34 ) = 76 x 50= 3800

 c) 136 x 68 + 16 x 2 x 136 = 136 x ( 68 + 32 ) = 136 x 100 = 13600

 d) 45 x 125 - 45 x 25 + 55 x 31 + 55 x 69 = 46 x ( 125-25) + 55 x ( 31+69) = 46 x100 + 55x 100 = 4600 + 5500 = 10100  

 e) 125 x 25 + 125 x 74 + 125 = 125 x( 25+74 +1 ) = 125 x 100 =12500

 f) 43,5 x 2015 x ( 630 - 315 x 2 ) = 43,5 x 2015 x 0 = 0 

 g) 0,2 x 41 x 36 + 0,8 x 9 x 58 + 1,2 x 6

= 0,2 x4 x41x 9 + 0,8 x 9 x 58  +7,2

=  (0,8 x9)x 41 + ( 0,8 x 9) x 58   + 7,2 x 1 

= 7,2 x 41 + 7,2 x 58 + 7,2 x 1 

= 7,2 x( 41+58+1)

= 7,2 x 100 = 720.

a) 652 + 327 + 148 + 73

=(73+327)+(652+148)

=400+800

=1200

b) 19 x 16 x 4 + 76 x 34

=76*16+76*34

=76*(16+34)

=76*50

=3800

c)136*68+16*2*136

=136*68+32*136

=136*(68+32)

=136*100

=13600

d)45*125-45*25+55*31+55*69

=45*(125-25)+55*(31+69)

=45*100+55*100

=100*(45+55)

=100*100

=10 000

e)125*25+125*74+125

=125*(25+75+1)

=125*100

=12 500

còn lại bạn tự làm đi mk mỏi tay lắm rồi

a) 234 x 95 + 234 x 4 + 234 = 234 x ( 95 + 4 + 1 ) = 234 x 100 = 23400

a).234 x 95 + 234 x 4 + 234 

= 234 x ( 95 + 4 + 1 ) 

= 234 x 100

= 23400

b)  ( 1+1/2) x ( 1+1/3) x ( 1+1/4 )

= ( 2/2+1/2 ) x ( 3/3+1/3 ) x ( 4/4 + 1/4)

=3/2 + 4/3 + 5/4

= 18/12 + 16/12 + 20/12

= 54/12

= 9 /2

x:6=24+6

x:6=30

x=30 x 6

x=180

23+x:2=37

x:2=37-23

x:2=14

x=14 x 2

x=28

214-136:x=197

136:x=214-197

136:x=17

x=136:17

x=8

(x-4):6:5=10

(x-4):6=10 x 5=50

(x-4)=50 x 6

x-4=300

x=300+4=304

(x+1)+(x+2)+...+(x+10)=755

10x + (1+2+...+10)=755

10x + (1+10) x [(10-1):1+1]:2=755

10x + 55 = 755

10x=755-55

10x=700

x=700:10=70

chúc bạn học tốt nha

ket qua la 48 k nha

x=130 nha bạn

k cho mình 8 cái nha

@#$%

\(\frac{2,4\times1994\times2+1,6\times3996\times3+1,2\times4010\times4}{3+7+11+...+95+99-275}\)

\(=\frac{0,2\times6\times2\times2\times997\times2+0,2\times8\times6\times666\times3+0,2\times6\times2\times2005\times4}{\left(99+3\right)\times49:2-275}\)

\(=\frac{0,2\times6\times8\times997+0,2\times8\times6\times666\times3+0,2\times6\times8\times2005}{2499-275}\)

\(=\frac{0,2\times6\times8\times\left(997+666\times3+2005\right)}{2224}\)

\(=\frac{0,2\times2\times3\times8\times\left(997+1998+2005\right)}{8\times2\times0,2\times695}\)

\(=\frac{3\times\left(2995+2005\right)}{695}\)

\(=\frac{3\times5000}{695}=\frac{3\times1000\times5}{5\times139}\)

\(=\frac{3\times1000}{139}=\frac{3000}{139}\)

\(a)\frac{41,5\times7,2\times48}{07,2}=1992\)

\(b)47,5\times8\times47,5\times4-95\)

\(=72200-95=72105\)

\(c)\frac{158\times81}{4,5\times2\times18}=\frac{79\times18}{18}=79\)

= 34,6 x 29,6 - 34,6 x 29,5

= (29,6 - 29,5 ) x 34,6

=0,1 x 34,6

= 3,46

34,6 x 29,6 - 17,3 x 2 x 2,95 : 0,1

= 34,6 x 29,6 - (17,3 x 2) x (2,95 : 0,1)

= 34,6 x 29,6 - 34,6 x 29,5

= 34,6 x (29,6 - 29,5)

=34,6 x 0,1 = 3,46