a. ….= 61 692 : 4 = 15 423

….= 33 164 : 4 + 28 528 : 4

….= 8291 + 7132 = 15 423

b. ….= 387 079 : 7 = 55 297

….= 403 494 : 7 – 16 414 : 7

….= 57 642 - 2345 = 55 297

415 x 42 + 415 x 33 + 415 x 25

= 415 x ( 42 + 33 + 25)

= 415 x 100

= 41500

415 x 73 - 415 + 116

= 30295 - 415 + 116

= 29880 + 116

= 29996 

câu này ko giải thuận tiện đc ạ.

415 x 73 - 415 + 116

Đề này k tính thuận tiện dc em

được ạ

Cách 1:

     \(\dfrac{3}{7}\) x \(\dfrac{16}{33}\) + \(\dfrac{16}{33}\) x \(\dfrac{4}{7}\)

=    \(\dfrac{48}{231}\) + \(\dfrac{64}{231}\)

= \(\dfrac{112}{231}\)

= \(\dfrac{16}{33}\)

cách 2:  \(\dfrac{3}{7}\) x \(\dfrac{16}{33}\) + \(\dfrac{16}{33}\) x \(\dfrac{4}{7}\)

       = \(\dfrac{16}{33}\) x ( \(\dfrac{3}{7}\) + \(\dfrac{4}{7}\))

      = \(\dfrac{16}{33}\) x \(\dfrac{7}{7}\)

     = \(\dfrac{16}{33}\)

9,3×6,7+3,3

Cách 1: (Tính bình thường)

= 16/77 + 64/231 (Quy đồng đi nha, mẫu chung là 231)

= 16/33

Cách 2: (Tính nhanh)

= 16/33 x ( 3/7 + 4/7 )

= 16/33 x 1

= 16/33

=16/33 x ( 3/7 + 4/7 )

= 16/33 x 1

= 16/33

16/33 nha bạn !

a,=(25.4).(125.8)

=100.1000

=100000

b,=789.10=7890

c,123.(125-24-30)

=123.71

=8733

d,=415.(98+1+1)
=415.10

=4150

`25xx125xx4xx8=(25xx4)xx(125xx8)=100xx1000=100000`

`789xx5xx2=789xx(5xx2)=789xx10=7890`

`123xx125-24xx123-123xx30=123xx(125-24-30)=123xx71=8733`

`415xx98+415+415=415xx(98+1+1)=415xx100=41500`

25x 125x4x8
= (25x4) x 125 x 8 
 = 100 x 1000
= 100000 

789x5x2
= 789 x 10 
= 7890 

123x125-24x123-123x30
= (125 - 24 - 30 ) x 123
= 71 x 123 
= 8733

415x98+415+415 ​
=( 98 + 1 + 1)x  415
= 100 x 415
= 41500

\(\frac{3}{7}x\frac{16}{33}+\frac{16}{33}x\frac{4}{7}\)

\(C1:=\frac{16}{77}+\frac{64}{231}=\frac{16}{33}\)

\(C2:=\frac{16}{33}\left(\frac{3}{7}+\frac{4}{7}\right)=\frac{16}{33}.1=\frac{16}{33}\)

học tốt ~~~

C1:3/7×16/33+16/33×4/7

=48/231+64/231

=112/231

C2:3/7×16/33+16/33×4/7

=16/33×(3/7+4/7)

=16/33×7/7

=113/231

C1 : \(\frac{3}{7}\times\frac{16}{33}+\frac{16}{33}\times\frac{4}{7}\)

\(=\frac{16}{77}+\frac{64}{231}\)

\(=\frac{16}{33}\)

C2 : \(\frac{3}{7}\times\frac{16}{33}+\frac{16}{33}\times\frac{4}{7}\)

\(=\frac{16}{33}\times\left(\frac{3}{7}+\frac{4}{7}\right)\)

\(=\frac{16}{33}\times1\)

\(=\frac{16}{33}\)

(7/15 + 8/15) + (9/16 + 7/16)

= 15/15 + 16/16

= 1 + 1

= 2