a ) x = − 4 5 − 1 2   ⇔   x = − 13 10 b ) x = − 3 4 − 2 3 ⇔ x = − 17 12 c ) − 3 5 : x = − 2 3 − 2 3 5 ⇔ − 3 5 : x = − 49 15 ⇔ x = − 3 5 : − 49 15 ⇔ x = 9 49  

?????????????????????/??///??//???/

x : 235 = 42                               56 - x = 23

x = 42 x 235                               x = 56 - 23

x = 9870                                    x = 33

Vậy x = 9870                             Vậy x = 33

x = 9870

x = 33

a) x:235=42

x=235x42

x=.............<tự ghi kết quả >

b)56-x=23

x=56-23

x=...........<cx tự tính luôn nha>

tk nha 

cm ơn nhìu 

\(a,8\times427\times3+6\times573\times4\)

\(=24\times427+24\times573\)

\(=24\times\left(427+573\right)\)

\(=24\times1000\)

\(=24000\)

\(b,6\times1235\times20-5\times235\times24\)

\(=120\times1235-120\times235\)

\(=120\times\left(1235-235\right)\)

\(=1235\times1000\)

\(=1235000\)

a: =24x427+24x573

=24000

$a,8\times 427\times 3+6\times 573\times 4$

$=24\times 427+24\times 573$

$=24\times \left(427+573\right)$

$=24\times 1000$

$=24000$

$b,6\times 1235\times 20-5\times 235\times 24$

$=120\times 1235-120\times 235$

$=120\times \left(1235-235\right)$

$=1235\times 1000$

$=1235000$

trl sẽ có like

a=8x3x6x4x(427+573)

a=8x3x6x4x1000

a=576000

a ) = (23 + 4) : 12

= 27 : 12

= 9 /4

b) = (235- 112):15

= 41/5

a) 23 : 12 + 4  : 12 

= ( 23 + 4 ) : 12

= 27 : 12 

= 2,25

b) 235 ; 15 - 112 : 15 

= ( 235 -112) : 15

= 123 : 15 

= 8,2

a)23:12 + 2:12 
= (23+4):12
= 27:12
=2,25
b) 235:15-112:15
= (235-112):15
=123:15
=8,2

a ) 1 12 + 2 3 + − 3 4 = 1 12 + 8 12 + − 9 12 = 0

b ) 1 2 − 2 5 + − 7 10 = 5 10 − 4 10 + − 7 10 = − 6 10 = − 3 5 c ) 1 2 + − 3 7 + 5 2 + − 4 7 = 1 2 + 5 2 + − 3 7 + − 4 7 = 2 d ) 9 8 − 4 7 + − 1 8 + 11 7 = 9 8 + − 1 8 + − 4 7 + 11 7 = 2 e ) 6 11 + − 2 3 + 5 11 = 6 11 + 5 11 + − 2 3 = 1 3 f ) − 1 2 + 11 4 − 11 4 − 1 2 = − 1 2 + 11 4 − 11 4 + 1 2 = 0

1) 23 . 45 + 23 . 55 - 23

= 23 . (45 + 55 - 1)

= 23 . 99

= 2277

2) 2349 : 2¹ + {67 . 1³ + [23 + 45 - (45 + 2)]}

= 2349 : 2 + {67 . 1 + [68 - (45 + 2)]}

= 1174,5 + {67 + [68 - 47]}

= 1174,5 + {67 + 21}

= 1174,5 + 88

= 1262,5

3) 23 + 3 . 9 + 56

= 23 + 27 + 56

= 50 + 56

= 106

5) x - 34 = 235 - 30

x - 34 = 205

x        = 205 + 34

x        = 239

a) 5.(x-20) = 35

(x-20) = 35:5

x-20 = 7

x = 27

b) (x+125) -301 = 56

x+125 -301 = 56

x - 176 = 56

x = 56 +176

x= 232

c) 215 + (x-21):2 = 235

(x-21):2 = 235 - 215

(x-21):2 = 20

x-21 = 20 .2

x-21 = 40

x = 61

d) (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

a) 5.(x - 20) = 35

⇒ x - 20 = 35 : 5

⇒ x - 20 = 7

⇒ x = 7 + 20

⇒ x = 27

b) (x + 125) - 301 = 56

⇒ x + 125 = 56 + 301

⇒ x + 125 = 357

⇒ x = 357 - 125

⇒ x = 232

c) 215 + (x - 21) : 2 = 235

⇒ (x - 21) : 2 = 235 - 215

⇒ (x - 21) : 2 = 20

⇒ x - 21 = 20 x 2 

⇒ x - 21 = 40

⇒ x = 21 + 40

⇒ x = 61

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

⇒ x : 23 + 45 = 8911 : 67

⇒ x : 23 + 45 = 133

⇒ x : 23 = 133 - 45

⇒ x : 23 = 88

⇒ x = 88 x 23

⇒ x = 2024

a) \(5.\left(x-20\right)=35\)

\(x-20=35:5\)

\(x-20=7\)

\(x=7+20\Rightarrow x=27\)

b) \(\left(x+125\right)-301=56\)

\(x+125=357\)

\(x=357-125\Rightarrow x=232\)

c) \(215+\left(x-21\right):2=235\)

\(\left(x-21\right):2=20\)

\(x-21=40\Rightarrow x=40+21\Rightarrow x=61\)

d) \(\left(x:23+45\right).67=8911\)

\(x:23+45=133\)

\(x:23=88\Rightarrow x=88.23\Rightarrow x=2024\)