\(a,C1=744+186\\ =930\\ C2=93\times\left(8+2\right)\\ =93\times10=930\\ b,C1:=324+576\\ =900\\ C2=9\times\left(36+64\right)\\ =9\times100\\ =900\\ c,C1=456-399\\ =57\\ C2=57\times\left(8-7\right)\\ =57\)

\(a)\)\(93\times8+93\times2\)

\(=98\times\left(8+2\right)\)

\(=98\times10\)

\(=980\)

\(b)36\times9+64\times9\)

\(=9\times\left(36+64\right)\)

\(=9\times100\)

\(=900\)

\(c)57\times8+57\times7\)

\(=57\times\left(8-7\right)\)

\(=57\times1\)

\(=57\)

\(43\times7+93\times43+57\times61+69\times57\)

\(=43\times\left(7+43\right)+57\times\left(61+69\right)\)

\(=43\times50+57\times130\)

\(=2150+7410\)

\(=9560\)

\(9560\)

     43 x 27 + 93 x 43 + 57 x 61 + 59 x 57 

  = 43 x ( 27 + 93 ) + 57 x ( 61 + 59 )

  =  43 x 120 +  57 x 120

  = 120 x ( 43 + 57 )

   = 120 x 100

  = 1200

b) 64 x 6 + 81 x 4 + 17 x 6 

 = 6 x ( 64 + 17 ) + 81 x 4 

 =  6 x 81 + 81 x 4 

 = 81 x ( 6 + 4 ) 

 = 81 x 10 

 = 810

A) =43 x (27+93)+57*(61+59)

=43*120+57*120

=120*(43+57)

=120*100

=12000

2x + x - 12 = 0

=> 3x = 12

=> x = 4

vậy_

2x + x - 12 = 0

2x + x = 0 + 12

2x + x = 12

3x = 12

x= 12 : 3

x = 4

64 .6 + 81 . 4 + 17 . 6

= 6 . ( 64 + 17 ) + 81 . 4

= 6 . 91 + 81 . 4

= 546 + 324

= 870 

43 . 27 + 93 . 43 + 57 . 61 + 59 . 57

= ngày mai giải tiếp, đi ngủ đã !!!-_-^zzz

a,12345679x45=12345679x9x5=111111111x5=555555555

b,43 x 37+93 x 43+57 x 61+69 x 57

=43x(37+93)+57(61+69)

=43 x 130+57 x 130

=130 x(43+57)

=130 x 100

=13000

7 x 17 x 125 = (8 x 125) x 17 = 1000 x 17 = 17000

4 x 37 x 25 = (25 x 4 ) x 7 = 100 x 7 = 700

43 x 27 + 93 x 43 + 57 x 81 + 69 x 57 = 43 x (27 + 93) + 57 x (81 +69) = 43 x 120 + 57 x 120 + 57x30 = 120 x (43 + 57) + 1710 = 12000 + 1710 = 13710 

a)  − 2 5 + 1 6 + − 1 5 ≤ x < − 3 4 + 9 7 + − 1 4 + 5 7 ⇔ − 13 30 ≤ x ≤ 1 ⇔ x ∈ 0 ; 1

b)  5 17 + − 4 9 + 12 17 < x ≤ − 3 7 + 7 15 + 4 − 7 + 8 15 + 9 3 ⇔ 5 9 < x ≤ 3 ⇔ x ∈ 1 ; 2 ; 3

a) 216 +(102-x) = 347

216 + 102 - x = 347

318 - x = 347

x = -29

b) 127 - (x+29) = 93

127 - x - 29 = 93

127 - 29 - x = 93

98 - x = 93

x = 5

c) ( x - 57) - 119 = 0

x - 57 - 119 = 0

x - (57+119) = 0

x - 176 = 0 

x  = 176

a, 216+(102-x)=347

102-x=347-216

102-x=131

x=102-131

x=-29

Vậy x=-29

b, 127-(x+29)=93

x+29=127-93

x+29=34

x=34-29

x=5

Vậy x=5

c, (x-57)-119=0

x-57=0+119

x-57=119

x=119+57

x=176

Vậy x=176

1.

$\sqrt{3x^2}-\sqrt{12}=0$

$\Leftrightarrow \sqrt{3x^2}=\sqrt{12}$

$\Leftrightarrow 3x^2=12$

$\Leftrightarrow x^2=4$

$\Leftrightarrow (x-2)(x+2)=0\Leftrightarrow x=\pm 2$

2. 

$\sqrt{(x-3)^2}=9$

$\Leftrightarrow |x-3|=9$

$\Leftrightarrow x-3=9$ hoặc $x-3=-9$

$\Leftrightarrow x=12$ hoặc $x=-6$

43x37+93x43+57x61+69x57=13000

1300

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