Bài làm

  27 x 632 + 43 x 632

= 632 x ( 27 + 43 )

= 632 x 70

= 44240

# Chúc bạn học tốt #

27 * 632 + 43 * 632

= ( 27 + 43 ) * 632

=     70 * 632

= 44240

k cho mình nha .

27x632+43x632

=(27+43)x632

=70x632

=44240

`[` Tham Khảo `]`

`35 xx 5 - 35 xx 2 + 35 xx7`

`= 35 xx (5-2+7)`

`= 35 xx 10`

`=350`

= 35 × (5 + 7 - 2)

= 35 × 10

= 350

=35×(5-2+7)

=35×10

=350

(25 x 4 ) x (35 x 6 ) = 100 x 210 = 21000

25 x 35 x 4 x 6 

= (25 x 4 ) x ( 35 x 6 ) 

= 100 x 210

= 21 000 

25x35x4x6

=(25x4) x (35x6)

=100x210

=21000

\(25\times35\times4\times6\)

\(=\left(25\times4\right)\times\left(35\times6\right)\)

\(=100\times210\)

\(=21000\)

\(25\times35\times4\times6\)

\(=\left(25\times4\right)\times\left(35\times6\right)\)

\(=100\times210\)

\(=21000\)

\(~HT~\)

=25 x 4 x (35 x 6)

=100 x 210

=21000

a) 2205 : (35 x 7) = ?

Cách 1 : 2205 : (35 x 7) = 2205 : 245 = 9

Cách 2 : 2205 : (35 x 7) = 2205 : 35 : 7 = 63 : 7 = 9

b) 3332 : (4 x 49) = ?

Cách 1 : 3332 : (4 x 49) = 3332 : 196 = 17

Cách 2 : 3332 : (4 x 49) = = 3332 : 4 : 49 =833 : 49 = 17

Nói thêm: còn cách tính thứ ba nữa:

a. … = 2205 : 35 : 7 = 63 : 7 = 9

b. ….= 3332 : 49 : 4 = 68 : 4 = 17

a,

c1: 2205:245=9

c2: 2205:35:7=9

b,

c1: 3332:196=17

c1: 3332:4:49=17

a) 2205 :(35 x 7)

C1: = 2205:35:7

=63:7

=9

C2: =2205:245 

=9

b, 3332:(4x49)

C1:= 3332:196

=17

C2: = 3332:4:49

=833:49

=17

a, C1: 2205 : ( 35 . 7 )

= 2205 : 245

= 9

C2 : 2205 : 35 : 7

= 63 : 7

= 9

b , Tương tự nhé

\(5\dfrac{3}{4}:3+2\dfrac{1}{4}\times\dfrac{1}{3}-\dfrac{1}{8}=\left(5\dfrac{3}{4}+2\dfrac{1}{4}\right)\times\dfrac{1}{3}-\dfrac{1}{8}\\ =8\times\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{8}{3}-\dfrac{1}{8}=\dfrac{61}{24}\\ ----\\ \dfrac{3}{5}:\dfrac{5}{6}:\dfrac{6}{7}:\dfrac{7}{8}+\dfrac{2}{5}+\dfrac{23}{35}\\ =\dfrac{3}{5}\times\dfrac{6}{5}\times\dfrac{7}{6}\times\dfrac{8}{7}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{18}{25}\times\dfrac{4}{3}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{353}{175}\)

35 . 34 + 35 . 38 + 65 . 75 + 65 . 45 + 35 . 34 = 

= 35 . 34 + 35 . 38 + 35 . 34 + 65 . 75 + 65 . 45 

= 35 . ( 34 + 38 + 34 ) + 65 . ( 75 + 45 )

=  35 . 110  + 65 . 110 

= 110 . ( 35 + 65 ) 

= 110 . 100

= 11000

Hok tốt!!!!!!!!!!!!!

a) Tính bằng cách hợp lí nhất :

35 . 34 + 35 . 38 + 65 . 75 + 65 . 45 + 35 . 34

= 35 . 34 + 35 . 38 + 35 . 34 + 65 . 75 + 65 . 45

= 35 . ( 34 + 38 + 34 ) + 65 . ( 75 + 45 )

= 35 . 106 + 65 . 120

= 3710 + 7800

= 11510

3 . 25 . 8 + 4 . 37 . 6 + 2 . 38 . 12

= 3 . 8 . 25 + 4 . 6 . 37 + 2 . 12 . 38

= 24 . 25 + 24 . 37 + 24 . 38

= 24 . ( 25 + 37 + 38 )

= 24 . 100

= 2400

b) Tìm số tự nhiên x, biết :

( x - 5 ) ( x + 7 ) = 0

\(\Rightarrow\orbr{\begin{cases}x-5=0\\x+7=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-7\end{cases}}}.\)

Vậy .......

3 . 25 . 8 + 4 . 37 . 6 + 2 . 38 . 12 = 

= 3 . 8 . 25 +  4 . 6 . 37 + 2 . 12 . 38

= 24 . 25 + 24 . 37 + 24 . 38

= 24 . ( 25 + 37 + 38 )

= 24 . 100 

= 2400

Hok tốt!!!!!!!!!!!

a ) \(=\frac{35\cdot42}{5\cdot2}=\frac{7\cdot5\cdot2\cdot21}{5\cdot2}\)

\(=\frac{7\cdot21}{1}=147\)

b) \(=\frac{54\cdot35}{7\cdot9}\)

\(=\frac{6\cdot9\cdot7\cdot5}{7\cdot9}\)

\(=\frac{6\cdot5}{1}=30\)

35x42/5x2= 5x7x2x12/5x2=84

54x35/7x9=6x9x7x5/7x9=30