a ) ( 165 + 99 + 165 x 1 ) - ( 163 x 101 - 163 x 1 ) 

= ( 165 x ( 99 + 1 ) ) - ( 163 x ( 101 - 1 ) )

= 165 x 100 - 163 x 100 

= 16500 - 16300

= 200

b ) 24 x 62 + 24 x 2 x 19

= 24 x 62 + 24 x 38

= 24 x ( 62 + 38 )

= 24 x 100

= 2400

= 

a) ( 165 x 99 + 165 x 1 ) - ( 163 x 101 - 163 x 1 )

= 165 x ( 99 + 1 )  -  163 x ( 101 - 1 )

= 165 x  100 - 163 x 100

= 100 x ( 165 - 163 )

= 100 x 2

= 200

b) 24 x 62 + 24 x 2 x 19

= 24 x 62 + 24  x 38

= 24 x ( 62 + 38 )

= 24 x 100

= 2400

( 165 x 99 + 165 x 1 ) - ( 163 x 101 - 163 x 1)

=[165 x ( 99 + 1 )] - [ 163 x ( 101 - 1)]

=165 x 100 - 163 x 100

= 100 x ( 165 - 163)

=100 x 2 = 200

24 x 62 + 24 x 2 x 19

= 24 x 62 + 24 x 38

= 24 x ( 62 + 38 )

=24 x 100 =2400

Tham khảo .-.

328 x 17 x (1859 - 326) x (49 x 24 - 98 x 12)

= 328 x 17 x 1533 x 0

= 0

Tính nhanh:

328 x 17 x ( 1859 - 326 ) x ( 49 x 24 - 98 x 12 )

= 328 x 17 x 1533 x 0 

=0

:D

328 x 17 x ( 1859 - 326 ) x ( 49 x 24 - 98 x 12 )

= 328 x 17 x ( 1859 - 326 ) x ( 98x 12 - 98 x 12 )

= 328 x 17 x ( 1859 - 326 ) x 0

= 0

a. x : 24 = 264 ( dư 13 )

=>x=264.24+13

x=3949

b. 6203 : x = 326 ( dư 9 )

=>x=6203:326+9

x= sai đề thì phải

a) x : 24 = 264 ( du 13 )

    x = ( 264 + 13 ) x 24 

     x =           6648

b) 6203 : x = 326 ( du 9 )

              x = ( 6203 + 9 ) : 326  

               x = ........

Sai đề thì phải , bạn à

a ) x : 24 = 264 ( dư 13 )

x          = ( 264 + 13 ) c 24

x          = 6648

b ) sai đề

`@` `\text {Ans}`

`\downarrow`

`A.`

`x-56 \times 24 = 286`

`x-1344 = 286`

`x=286 + 1344`

`x=1630`

`B.`

`65 \times 54 - x = 1026`

`3510 - x =1026`

`x=3510 - 1026`

`x=2484`

`C.`

`36 \times 84 \div x = 72`

`3024 \div x = 72`

`x=3024 \div 72`

`x=42`

`D.`

`x \div 47 = 326 - 277`

`x \div 47 = 49`

`x= 49 \times 47`

`x=2303`

A. \(x-56\times24=286\\ x-1344=286\\ x=286+1344\\ x=1630\)

B. \(65\times54-x=1026\\ 3510-x=1026\\ x=3510-1026\\ x=2484\)

C. \(36\times84\div x=72\\ 3024\div x=72\\ x-3024\div72\\ x=42\)

D. \(x\div47=326-277\\ x\div47=49\\ x=49\times47\\ x=2303\)

\(\frac{4}{5}\)x\(\frac{3}{x}\)x\(\frac{2}{11}=\frac{24}{165}\)

\(\Rightarrow\frac{4}{5}\)x\(\frac{3}{x}\)x\(\frac{2}{11}=\frac{8}{55}\)

\(\Rightarrow\frac{4}{5}\)x\(\frac{3}{x}\)= \(\frac{8}{55}\):\(\frac{2}{11}\)

\(\Rightarrow\frac{4}{5}\)x\(\frac{3}{x}\)=\(\frac{4}{5}\)

\(\Rightarrow\frac{3}{x}\)=\(\frac{4}{5}:\frac{4}{5}\)

\(\Rightarrow\frac{3}{x}=1\)

\(\Rightarrow\frac{3}{x}=\frac{3}{3}\)

\(\Rightarrow x=3\)

a) 72 x 212 + 27 x 121 + 121

= 72 x 212 + 27 x 121 + 121

= 72 x 212 + 27 x 121 + 121 x 1

= 72 x 212 + (27 + 1) x 121

= 72 x 212 + 28 x 121

= 72 x (121 + 91) + 28 x 121

= 72 x 121 + 72 x 91 + 28 x 121

= (72 + 28) x 121 + 72 x 91

= 100 x 121 + 72 x 91

= 12100 + 6552

= 18652 (anh thấy bài này sao ý)

b) (165 x 99 + 165) - ( 163 x 101 - 163)

= (165 x 99 + 165 x 1) - ( 163 x 101 - 163 x 1)

= [165 x (99 + 1)] - [163 x (101 - 1)]

= 165 x 100 - 163 x 100

= 16500 - 16300

= 200

c) 24 x 62 + 48 x 19

= 24 x 62 + (24 + 24) x 19

= 24 x 62 + 24 x 19 + 24 x 19

= 24 x (62 + 19 + 19)

= 24 x 100

= 2400

d) 24 x 76 + 48 x 12 - 20 x 100

= 24 x 76 + (24 + 24) x 12 - 20 x 100

= 24 x 76 + 24 x 12 + 24 x 12 - 20 x 100

= 24 x (76 + 12 + 12) - 20 x 100

= 24 x 100 - 20 x 100

= 100 x (24 - 20)

= 100 x 4

= 400

( nhớ tính lại xem đúng ko nha, anh lỡ có sai thì chết. Bài nào sai báo ngay cho anh )

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