a) 3,24 x 2,6 + 32,4 x 0,47

= 3,14 x 2,6 + 3,24 x 10 x 0,47

= 3,14 x 2,6 + 3,24 x 4,7

= 3,14 x (2,6 + 4,7)

= 3,14 x 7,3

= 22,922

b) tự làm như a

a)3.24x2.6+32.4x0.47                                              

=3.24x10x0.26+32.4x0.47

=32.4x0.26+32.4x0.47

=32.4x(0.26+0.47)

=32.4x0.73

=23.652

b)0.504x154+50.4x0.54

=0.504x100x1.54+50.4x0.54

=50.4x1.54+50.4x0.54

=50.4x(1.54+0.54)

=50.4x2.08

=104.832

a) 3.24 x 2.6 + 32.4 x 0.74 

= 3.24 x 2.6 + 32.4 : 10 x 0.74 x 10

= 3.24 x 2.6 + 3.24 x 7.4 

= 3.24 x (2.6 + 7.4)

= 3.24 x 10 

= 32.4

0,504 × 154 - 50,4 × 0,54 = 50,4

14,69664 

0.504x154-50.4x0.54

=77.616-24.216

=50.4

a, 42x(54+17):71

=42x71:71=42

b, 123x(154-65):89

=123x89:89=123

c,324x(6+4):324

=324x10:324=10x324:324=10

\(a)\left(42\times54+17\times42\right):71\)

\(=42\times54+17\times42:71\)

\(=42\times\left(54+17\right):71\)

\(=42\times71:71\)

\(=42\)

\(b)\left(123\times154-65\times123\right):89\)

\(=123\times154-65\times123:89\)

\(=123\times\left(154-65\right):89\)

\(=123\times89:89\)

\(=123\)

\(c)\left(324\times6+4\times324\right):\left(162\times2\right)\)

\(=324\times6+4\times324:324\)

\(=324\times\left(6+4\right):324\)

\(=324\times10:324\)

\(=3240:324\)

\(=10\)

Mọi ngừi ơi mau lên nha mik đang cần gấp 

b1 A=10000 B=23386

b2 a,x=5 

b,x=4 x=2 

có lẽ bn nên tự lm thì hơn

a: \(x^2-10x=-25\)

\(\Leftrightarrow x-5=0\)

hay x=5

b: \(x^2-6x+8=0\)

\(\Leftrightarrow\left(x-2\right)\left(x-4\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=4\end{matrix}\right.\)

    3034 - 4,5 \(\times\) 3,4 - 3,4 \(\times\) 6,5 + 3,4

=  3034 - 4,5 \(\times\) 3,4 - 3,4 \(\times\) 6,5 + 3,4 \(\times\) 1

= 3034 - 3,4 ( 4,5 + 6,5 - 1)

= 3034 - 3,4 \(\times\) { 11 - 1}

= 3034 - 3,4 \(\times\) 10

= 3034 - 34

= 3000

14,36 x 1,78 x 2,45 x ( 9 x 0,9 + 0,9 - 0,9 x 10 )

=14,36 x 1,78 x 2,45 x [0,9x(9+1-10)]

=14,36 x 1,78 x 2,45 x [0,9x0]

=14,36 x 1,78 x 2,45 x 0 

=0 

=14,36x1,78x2,45x0

=0

14,36 x 1,78 x 2,45 x ( 9 x 0,9 + 0,9 - 0,9 x 10 )

=14,36 x 1,78 x 2,45 x [0,9x(9+1-10)]

=14,36 x 1,78 x 2,45 x [0,9x0]

=14,36 x 1,78 x 2,45 x 0 

=0 vì 0 nhân với số nào cũng =0

\(0,36\text{×}550+0,18\text{×}126\text{×}2+3\text{×}324\text{×}0,12\)

\(=0,36\text{×}550+0,18\text{×}2\text{×}126+3\text{×}0,12\text{×}324\)

\(=0,36\text{×}550+0,36\text{×}126+0,36\text{×}324\)

\(=0,36\text{×}\left(550+126+324\right)=0,36\text{×}1000=360\)

0,36 x 550 + 0,18 x 126 x2 + 3 x 324 x 0,12

= 0,36 x 550 + 0,36 x 126 + 0,36 x 324

= 0,36 x ( 550 + 126 + 324 )

= 0,36 x 1000 

= 360 

đúng chưa ?

tích đi

ko tích mét mẹ đó :)))

=22,5x(13+97)+25x(44,9+5,1)

=2475+1250

=3725

22,5 " 13 - 44,9 " 25 + 22,5 "97 - 5,1 " 25 

= 22,5 " 25  " { 97 - 44,9 + 5,1  - 13 }

= 562,5 " 34 

= 19125 nhé.

(22,5 x 13+22,5 x 97)-(44,9 x 25+5,1 x 25) 

=22,5 x (13+97)-(44,9 + 5,1) x 25

=22,5 x 110-50 x 25

=2475-1250

=1225