\(78+23\cdot81-69=78+1863-69\)

                                   \(=1941-69\)

                                   \(=1872\)

\(78+23\cdot\left(81-69\right)=78+23\cdot12\)

                                        \(=78+276\)

                                        \(=354\)

\(\left(78+23\right)\cdot81-69=101\cdot81-69\)

                                        \(=8181-69\)

                                        \(=8112\)

\(\left(78+23\right)\cdot\left(81-69\right)=101\cdot12\)

                                              \(=1212\)

1872

354

8112

1212

a) 45 x 76 + 90 x 12

= 45 x 76 + 45 x 2 x 12

= 45 x 76 + 45 x 24

= 45 x ( 76 + 24 ) 

= 45 x 100

= 4500

b) 2 x 31 x 12 + 4 x 6 x 69

= 24 x 31 + 24 x 69

= 24 x ( 31 + 69 )

= 24 x 100

= 2400

c) 36 x 28 + 36 x 82 + 64 x 69 + 64 x41

= 36 x ( 28 + 82 ) + 64 x ( 69 + 41 )

= 36 x 110 + 64 x 110

= 110 x ( 36 + 64 )

= 110 x 100

= 11 000

d) 156 ( x + 61)  = 82

=> x + 61 = \(\frac{82}{156}\)

=> x + 61 = \(\frac{41}{78}\)

=> x = \(\frac{41}{78}\)- 61

=> x = \(\frac{-4717}{78}\)

45 x 76 + 90 x 12 = 45 x 76 + 45 x 2 x 12

= 45 x 76 + 45 x 24

= 45 x (76 + 24)

= 45 x 100 

= 4500

b) 2 x 31 x 12 + 4 x  6 x 69 = 62 x 12 + 2 x 12 x 69

= 62 x 12 + 138 x 12

= (62 + 138) x 12

= 200 x 12 = 2400

a, 45 x 76 + 90 x 12

= ( 45 x 12 ) + ( 76 x 90 )

=  540     +   6840

=     7 380

c,

= 36 x ( 28 + 82 ) +  64 x ( 69 + 41 )

= 36 x  110    +   64 x 110

= 110 x ( 36 + 64 )

= 110 x 100

= 11000

B; 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41

= 36 x (28+82) + 64 x (69 + 41)

= 36 x 110 + 64 x 110

= (36+64) x 110

= 100 x 110

= 11000

b) 36 nhan ( 28+82) + 64 nhan ( 69 + 41)

= 36. 110 + 64 . 110

= 110 . ( 36 + 64 )

= 110 .100

=11000

a) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3

= 24 x 31 + 24 x 42 + 24 x 27

= 21 x ( 31 + 42 + 27)

= 21 x 100

= 2100

b) 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41

= 36 x ( 28 + 82) + 64 x ( 69 + 41)

= 36 x 110 + 64 x 110 

= 110 x ( 36 + 64)

= 110 x 100

= 11000

a)2 x 31 x12 + 4 x 6 x 42 + 8 x 27 x 3

= 24 x 31 + 24 x 42 + 24 x 27

= 24 x (31 + 24 + 27)

=24 x 82

=1968

b)36 x 28 + 36 x 82 + 64 x 69 + 64 x 41

=36 x (28 + 82) + 64 x ( 69 + 41 )

=36 x 110 + 64 x 110

=3960 + 7040

=11000

a) 2x31x12+4x6x42+8x27x3

=2x12x31+4x6x42+8x3x27

=24x31+24x42+24x27

=24x(31+42+27)

24x100=2400

b)36x28+36x82+64x69+64x41

=36x(28+82)+64x(69+41)

=36x110+64x110

2 x 31 x 12+ 4 x 6 x 42 + 8 x 3 x 27 = 24 x 31 + 24 x 42 + 24 x 27 = 24 x (27 + 31 + 42) = 24 x 100 = 2400

b) 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41 = 36 x (28 + 82)  + 64 x (69 + 41) = 36 x 110 + 64 x 110 = 110 x (64 + 36) = 110 x 100 = 11000

Cài vào điện thoại phần mềm photo math, nó sẽ hỗ trợ bạn các tính nhanh luôn, cách dùng thid seach bác google hen.

bn ơi hãy lấy máy tính

mà tính đó bna j

tính thế này thì mất

mấy tiếng

Câu 1:2x31x12+4x46x42+8x27x3=9120

Câu 2 :........................................=12280

k and kb nha

`@` `\text {Ans}`

`\downarrow`

`2023 \times 14 + 2023 \times 83+97`

`= 2023 \times (14+83) + 97`

`= 2023 \times 97 + 97`

`= 196231 +97`

`= 196328`

`78 \times 31+78 \times 24+78 \times 17+78 \times 22 \times 72`

`= 78 \times (31+24+17+22 \times 72)`

`= 78 \times (31+24+17+1584)`

`= 78 \times 1656`

`= 129168`

`371 \times 69+371 \times 14+629 \times 83`

`= 371 \times (69+14) + 629 \times 83`

`= 371 \times 83 + 629 \times 83`

`= 83 \times (371+629)`

`= 83 \times 1000`

`= 83000`

`91 \times 51+49 \times 163-49 \times 72`

`= 91 \times 51 + 49 \times (163-72)`

`= 91 \times 51+49 \times 91`

`= 91 \times (51+49)`

`= 91 \times 100`

`= 9100`

`3 \times 12 \times 17 + 4 \times 9 \times 81 + 2 \times 6 \times 6`

`= 9 \times 4 \times 17 + 4 \times 9 \times 81 + 4 \times 9 \times 2`

`= 9 \times 4 \times (17+81+2)`

`= 36 \times 100` 

`= 3600`

`42 \times 17 + 58 \times 83 \times 42 \times 83 + 42 \times 83 + 17`

`= 17 \times (42+58) + 42 \times 83 \times (58 \times 83 +1)`

`= 17 \times 100 + 3486 \times 4815`

`= 1700 + 16785090`

`= 16786790`