1) \(373737.73-37.737373\)

\(=37.10101.73-37.73.10101\)

\(=0\)

2) \(19.41414141-41.19191919\)

\(=19.41.1010101-41.19.1010101\)

\(=0\)

3) \(123456.456789456789-456789.123456123456\)

\(=123456.456789.1000001-456789.123456.1000001\)

\(=0\)

4) \(250.12.7\)

\(=250.4.3.7\)

\(=\left(250.4\right).\left(3.7\right)\)

\(=1000.21\)

\(=21000\)

5) \(24.125.9\)

\(=3.8.125.9\)

\(=\left(3.9\right).\left(8.125\right)\)

\(=27.1000\)

\(=27000\)

6) \(125.44.18\)

\(=125.4.11.2.9\)

\(=\left(125.4.2\right).\left(11.9\right)\)

\(=1000.99\)

\(=99000\)

7) \(8.24.6+12.4.52+2.22.24\)

\(=48.24+48.52+48.22\)

\(=48\left(24+52+22\right)\)

\(=48.98\)

\(=48\left(100-2\right)\)

\(=48.100-48.2\)

\(=4800-96\)

\(=4704\)

8) \(18.58.2-9.27.4+12.69.3\)

\(=36.58-36.27+36.69\)

\(=36\left(58-27+69\right)\)

\(=36.100=3600\)

9) \(30.85.3+18.72.5-45.37.2-9.20.10\)

\(=90.85+90.72-90.37-90.20\)

\(=90\left(85+72-37-20\right)\)

\(=90.100=9000\)

B. 18/24

b nhé

Đáp án B là đáp án đúng :>

Đáp án

b,18/24

đáp án b 18/24

mình cần rất gấp mong mọi người giúp đỡ

\(4dam^224m^2=4,24m^2\)

\(A=\frac{9}{15.18}+\frac{9}{18.21}+.....+\frac{9}{89.92}\)

\(A=3.\left(\frac{3}{15.18}+\frac{3}{18.21}+....+\frac{3}{89.92}\right)\)

\(A=3.\left(\frac{1}{15}-\frac{1}{18}+\frac{1}{18}-\frac{1}{21}+......+\frac{1}{89}-\frac{1}{92}\right)\)

\(A=3.\left(\frac{1}{15}-\frac{1}{92}\right)\)

\(A=3.\frac{77}{1380}=\frac{77}{460}\)

$A=\frac{9}{15.18}+\frac{9}{18.21}+.....+\frac{9}{89.92}$

$A=3.\left(\frac{3}{15.18}+\frac{3}{18.21}+....+\frac{3}{89.92}\right)$

$A=3.\left(\frac{1}{15}-\frac{1}{18}+\frac{1}{18}-\frac{1}{21}+......+\frac{1}{89}-\frac{1}{92}\right)$

$A=3.\left(\frac{1}{15}-\frac{1}{92}\right)$

$A=3.\frac{77}{1380}=\frac{77}{460}$

a: =-9/11+2/3=-27/33+22/33=-5/33

b: =(16/29-13/29)+12/39-16/39

=3/29-4/39=1/1131

d: =(-111,82-8,18)+(13,3+16,7)=-120+30=-90

24/18=4/3=72/54=48/36=12/9

\(\dfrac{24}{18}=\dfrac{72}{54}=\dfrac{48}{36}=\dfrac{12}{9}=\dfrac{4}{3}\)

24/18=4/3=72/54=48/36=12/9

a)=180:90

=2

b)=240:24

=10

c)=6480:540

=12

d)171:9

=19

a, 180 : (18.5) = 180 :90 = 2

b, 240 : (2.3.4) = 240 : 24 = 10

c, (15.18.24)  : ( 5.9.12)

 = 6480 : 540 =12

d, ( 27 + 45 + 18 + 81) : 9

 = 3 + 5 + 2 + 9 = 19

a, 180 : (18 .5) = 180 : 90 = 2

b,  240 : ( 2.3.4) = 240 : 24= 10

c, ( 15. 18. 24 ) : ( 5.9.12) =6480 : 540=12

d, ( 27 +45 + 18 +81) : 9

  =  171 : 9

  = 19

Bài 1:

a: \(=\dfrac{21}{7}\cdot\dfrac{15}{45}\cdot\dfrac{9}{18}=3\cdot\dfrac{1}{3}\cdot\dfrac{1}{2}=\dfrac{1}{2}\)

b: \(=\dfrac{11}{33}\cdot\dfrac{24}{8\cdot12}\cdot\dfrac{27}{9}=\dfrac{24}{96}=\dfrac{1}{4}\)