\(341.67+341.16+659.83=341\left(67+16\right)+659.83\)

                                                      \(=341.83+659.83\)

                                                      \(=83\left(341+659\right)\)

                                                      \(=83.1000=83000\) 

341x67+341x16+659x83

=341x(67+16)+659x83

=341x83+659x83

=83x(341+659)

=83x1000

=83000

nhớ tk mk nhé các bn

a) 3636:(12x-91) =36

12x-91 = 3636:36

12x-91=101

12x=101+91

12x=192

x=192:12

x=16

b) (x : 23+45).67=8911

(x : 23+45)=8911:67

(x : 23+45)=133

x:23=133-45

x:23=88

x=88.23

x=2024

c) 420+65.4 =(x+175):5+30

420+260=(x+175):5+30

680=(x+175):5+30

(x+175):5=680-30

(x+175):5=650

(x+175)=650x5

(x+175)=3250

x=3250-175

x=3075

d) (32.15):2=(x+70):14-10

480:2=(x+70):14-10

240=(x+70):14-10

(x+70):14=240+10

(x+70):14=250

(x+70)=250.14

(x+70)=3500

x=3500-70

x=3430

e)x-4867=(175.2-50.70):25+23

x-4867=(350-3500):25+23

x-4867=-3150:25+23

x-4867=-126+23

x-4867=-103

x=-103+4867

x=4764

Tính bằng cách thuận tiện nhất :

a. 67 x 126 - 67 x 84 - 41 x 67 - 67

= 67 x 126 - 67 x 84 - 41 x 67 - 67 x 1

= 67 ( 126 - 84 - 41 - 1 )

= 67 x 0

=0

b. 36 x 2 x 2 + 7 x 28

=  2 ( 36 x 2 + 14 x 7 )  

= 2 x 170

= 340

c. 24 x 18 + 12 x 64

= 12 x 2 x 18 + 12 x 64

= 12 ( 2 x 18 + 64)

= 12 x 100

= 1200

a. 67 x 126 - 67 x 84 - 41 x 67 - 67

= 67 x 126 - 67 x 84 - 41 x 67 - 67 x 1

= 67 ( 126 - 84 - 41 - 1 )

= 67 x 0

=0

b. 36 x 2 x 2 + 7 x 28

=  2 ( 36 x 2 + 14 x 7 )  

= 2 x 170

= 340

c. 24 x 18 + 12 x 64

= 12 x 2 x 18 + 12 x 64

= 12 ( 2 x 18 + 64)

= 12 x 100

= 1200

67x126-67x84-41x67-67

=67x126-67x84-41x67-67x1

=67x(126-84-41-1)

=67x0

=0

36x2x7+7x28

=2(36x2+14x7)

=2x170

=340

24x18+12x64

=12x2x18+12x64

=12(2x18+64)

=12x100

=1200

\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)

\(=1235\text{×}6789\text{×}\left(630-630\right)\)

\(=1235\text{×}6789\text{×}0=0\)

\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)

\(=167\text{×}67+167\text{×}33\)

\(=167\text{×}\left(67+33\right)\)

\(=167\text{×}100=16700\)

\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)

\(=72+72+72+72+24+168\)

\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)

a) \(1235\times6789\times\left(630-630\right)\)

\(=1235\times6789\times0\)

\(=1235\times0\)

\(=0\)

b) \(167\times67+167\times33\)

\(=167\times\left(67+33\right)\)

\(=167\times100\)

=16700

73+36+968+914+3032

=73+(36+914)+(968+3032)

=73+950+4000

=5023

1) ( mk khong viet lai de dau nhe! )

a)= 73 + ( 36 + 914 ) + ( 968 + 3032 )

= 73 + 950 + 4000

= 1023 + 4000

= 5023

b)=314 x ( 67 + 16) + 659 x 83

= 314 x 83 + 659 x 83

= ( 314 + 659 ) x 83

= 973 x 83

= 80759

1) 73+36+968+914+3032

=(36+914)+(968+3032)+73

=950+4000+73

=5023

 341×67+341×16+659×83

=341×(67+16)+659×83

=341×83+659×83

=(341+659)×83

=1000×83

=83000

2)3636÷(12×x-91)=36

<=>12×x-91=3636÷36

<=>12×x-91=101

<=>12×x=101+91

<=>12×x=192

<=>x=192÷12

<=>x=16

Vậy x=16

(x÷23+45)×67=8911

<=>x÷23+45=8911÷67

<=>x÷23+45=133

<=>x÷23=133-45

<=>x÷23=88

<=>x=2024

Vậy x= 2024

(x-7/8)-15/64=3/4

<=>x-7/8=3/4+15/64

<=>x-7/8=63/64

<=>x=63/64+7/8

<=>x=119/64

Vậy x=119/64

Hok tốt 

k mk nha

a. 3636 : (12x - 91) = 36

=> 12x - 91 = 3636 : 36

=> 12x - 91 = 101

=> 12x = 101 + 91

=> 12x = 192

=> x = 192 : 12

=> x = 16

b. (x : 23 + 45). 67 = 8911

=> x : 23 + 45 = 8911 : 67

=> x : 23 + 45 = 133

=> x : 23 = 133 - 45

=> x : 23 = 88

=> x = 88 . 23

=> x = 2024

c. (19x + 2.5²) : 14 = (13 - 8)² - 4

=> (19x + 2.25) : 14 = 5² - 4

=> (19x + 50) : 14 = 25 - 4

=> (19x + 50) : 14 = 21

=> 19x + 50 = 21. 14

=> 19x + 50 = 294

=> 19x = 294 - 50

=> 19x = 244

=> x = 244 : 19

=> x = 244/19 (Xem lại đề)

d. -12 .(x - 5) + 7.(3 - x) = 5

=> -12x + 60 + 21 - 7x = 5

=> -19x + 81 = 5

=> -19x = 5 - 81

=> -19x = -76

=> x = -76 : (-19)

=> x = 4

3636:(12.x-76):4=36

Các bạn giúp với

3(x+2)²+(2x-1)²-7(x-3)(x+3)=36

<--> 3(x²+4x+4)+(4x²-4x+1)-7(x²-9)=36

<--> 3x²+12x+12+4x²-4x+1-7x²+63=36

<-->8x+76=36

<-->8x= -40

<--> x= -5