=(156,7 - 156,7) x ( 0,78 - 0,78) + 15,67

= 0 + 15,67

= 15,67

tìm X;

X - 18,15 = 11,8

X = 11,8 + 18,15

X = 29.95

tính giá trị biểu thức;

32,5 - 3 x 0,87 = 32,5 - 2,61 = 29.89

`x - 18,15=11,8`

`x            = 11,8+18,15`

`x            = 29,95`

`32,5- 3 xx 0,87`

`= 32,5 - 2,61`

`= 29,89`

2.34 x 1.3 + 23.4 x 0.87

= 2.34 x 1.3 + 2.34 x 8.7

= 2.34x( 1.3+8.7 )

= 2.34 x 10

= 23.4

2,34 x 1,3 + 23,4 x 0,87 

= 2,34 x1,3 + 2,34 x 8,7

=2,34 x (1,3 + 8,7)

=2,34 x 10

=23,4

x - 7,25 = 1,92+2,06

<=>x - 7,25 = 3,98

<=> x           = 3,98 + 7,25

<=> x           = 11,23

Vậy x = 11,23

x+3,7 = 8,6 + 5,75

<=> x + 3,7= 14,35

<=> x          = 14,35-3,7

<=> x          = 10,65

Vậy x = 10,65

6,2 + x  = 8,8 + 3,92

<=> 6,2 + x = 12,72

<=> x           = 12,72 - 6,2

<=> x          = 6,52

Vậy x = 6,52

1,8-x = 0,2 + 0,87

<=> 1,8 - x = 1,07ậy x = 0,72

<=> x          = 1,8 - 1,07

<=> x           = 0,73

Vậy x = 0,73

a) \(2\cdot31\cdot12+4\cdot6\cdot41+8\cdot28\cdot3\)

\(=24\cdot31+24\cdot41+24\cdot28\)

\(=24\cdot\left(31+41+28\right)\)

\(=24\cdot\left(72+28\right)\)

\(=24\cdot100\)

\(=2400\)

b) \(3,9\cdot\dfrac{13}{10}+\dfrac{0,87}{0,01}\cdot0,39\)

\(=\dfrac{3,9}{10}\cdot13+87\cdot0,39\)

\(=0,39\cdot13+87\cdot0,39\)

\(=0,39\cdot\left(13+87\right)\)

\(=0,39\cdot100\)

\(=39\)

a. 1,2,3,4,5,6,7,8,9,10

b. 200 Tick CHo MÌNh NHÉ BN HIỀn !!!!!!!!!!!!!!!

23.4 nha bạn!

\(2,34\times1,3+23,4\times0,87\)

\(=2,34\times1,3+2,34\times10\times0,87\)

\(=2,34\times1,3+2,34\times8,7\)

\(=2,34\times\left(1,3+8,7\right)\)

\(=2,34\times10\)

\(=23,4\)

A = (  0,87 +6,4 ).(1,25.7 - 4/5.1,25)+31,64

A= 7,2.7,75+31,64

A=55,8+31,64

A=87,44

(0,87 + 6,4) . (1,25 . 7 - 4/5 . 1,25) + 31,64

= 7,27 . (8,75 - 1) + 31,64

= 7,27 . 7,75 + 31,64

= 56,3425 + 31,64

= 87,9825