456.5 x (5 + 5 )  - 35.69 x ( 50 + 50 )

=4565 - 3569

= 996

thanks nha

ko có gì nếu có bài khó bảo mik nhé 

521,42x (5+5) +42,14x (50+50)=

=521,42x10 +42,14x 100

=   5214,2    +     4214

=      4735,4

=521,42 x (5-5) + 42,14 x (50 -50)

=521,42 x 0 + 42,14 x0

=0+0=0

đúng thì tick nhá

1000 x 50 = 50000

50 x 5 + 15 x 50

= 50 x (5+ 15)

= 50 x 20 

= 1000

50 x 5 + 15 x 50

= 250 + 750

= 1000

50 x 5 + 15 x 50

=50x(5+15)

=50x20

=1000

a)

( 360 x 10 x 50 ) : 5

= 360 x [ {10 x 50} : 5 ]

= 360 x [ 500 : 5 ]

= 360 x 100

= 36000

b) 

 ( 360 x 50 x 110) : ( 5 x 11 x 9)

= ( 360 : 9 ) x ( 50 : 5 ) x ( 110 : 11 )

= 40 x 10 x 10

= 4000

( 360 x 10 x 50 ) : 5

= 180000 : 5

= 36000

(360 x 50 x 110 ) : (5 x 11 x 9)

= 1980000 : 495

= 4000

tính nhanh =400

tìm x=15

k chomki,mik k lại

tính nhanh :

10 + 20 + 50 + 90 + 100 + 80 + 50

= (10 + 90) + (20 + 80) + (50 + 50) + 100

=      100    +       100    +     100    +  100

=      100 x 4 

=    400

tìm x :

x + 5 = 10 x 2

x + 5 = 20

       x = 20 - 5

       x = 15

tchs mình tch lại

10+20+50+90+100+80+50

=(10+90)+(20+80)+(50+50)+100

=100+100+100+100

=100x4

=400

x+5=10x2

=>x+5=20

=>x=20:5

=>x=4

217 x 45 + 50 x 217 + 217 x 5

= 217 x (45 + 50 + 5)

= 217 x 100

= 21 700

utoyoi

293 x 45 + 293 x 50 x 5

= 293 x 45 + 293 x 250

= 293 x ( 45 + 250 ) 

= 293 x 295

= 86435

293 x 45 + 293 x 50 x 5 

= 293 x ( 45 + 50 + 5 ) 

= 293 x    100

= 29300

k minh nha

=293x(45+50)x5

=293x95x5

=139175

a)\(\frac{45,2}{Y}+\frac{57,8}{Y}-\frac{71,8}{Y}\)=4,8

\(\frac{\left(45,2+57,8\right)-71,8}{Y}\)=4,8

=\(\frac{103-71,8}{Y}=4,8\)

\(\frac{31,2}{Y}=4,8\)

 Y=\(\frac{31,2}{4,8}\)

Y=6,5.

b)107,8-\(\frac{Y}{9,5}\)=29,2

\(\frac{Y}{9,5}\)=107,8-29,2

\(\frac{Y}{9,5}\)=78,6

Y=78,6 x 9,5

Y=746,7

Bt2 

a)175,84 x 3 -173,4+175,84 x 7 -62,6

=175,84 x (3+7) - (173,4+62,6)

=175,84 x 10 -236

=1758,4-236

=1522,4

b)521,12 x 5 -42,14 x 50+521,12 x 5 -42,14 x 50

=2(521,12 x 5 -42,14 x 50)

= 2 x (5 x (521,12 -42,14 x 10))

=2 x (5 x 99,72)

=2 x 498,6

=997,2.

Cho xin nhá :))