\(\left(126,74\times126,72+18,63:0,9\right)\times\left(126-12,6:0,125-12,6\times2\right)\)

\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-\left(12,6:0,125+12,6\times2\right)\right]\)

\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-\left(12,6\times8+12,6\times2\right)\right]\)

\(=\left(126,74\times126,72+18,63:0,9\right)\times\left\{126-\left[12,6\times\left(8+2\right)\right]\right\}\)

\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-(12,6\times10)\right]\)

\(=\left(126,74\times126,72+18,63:0,9\right)\times\left(126-126\right)\)

\(=\left(126,74\times126,72+18,63:0,9\right)\times0\)

\(=0\)

$\left(126,74\times 126,72+18,63:0,9\right)\times \left(126-12,6:0,125-12,6\times 2\right)$

$=\left(126,74\times 126,72+18,63:0,9\right)\times \left[126-\left(12,6:0,125+12,6\times 2\right)\right]$

$=\left(126,74\times 126,72+18,63:0,9\right)\times \left[126-\left(12,6\times 8+12,6\times 2\right)\right]$

$=\left(126,74\times 126,72+18,63:0,9\right)\times \left\{126-\left[12,6\times \left(8+2\right)\right]\right\}$

$=\left(126,74\times 126,72+18,63:0,9\right)\times \left[126-(12,6\times 10)\right]$

$=\left(126,74\times 126,72+18,63:0,9\right)\times \left(126-126\right)$

$=\left(126,74\times 126,72+18,63:0,9\right)\times 0$

$=0$

=(126,73^2-1+20,7)*(126-12,6*8-12,6*2)

=0

2057,75 – (36+12,6) : 0,9 x 0,5

=2057,75 –48,6: 0,9 x 0,5

=2057,75 –27

=2030,75

làm ơn đi

=2057,75-54*0,5

=2057,75-27

=2030,75

a, 12,6 – 7,859 = 4,471

b, 26,85 + 1,76 + 0,9 = 29,51

c, 78,2 x 5,84 = 456,688

d, 455 : 7,28 = 62,5

a) 4,471

b) 29,51

c) 456,688

d) 62,5

1,26

0,205

0,126

0,4715

0,0126

0,5035

ai tk cho mk thì mk tk lại cho

12.6*0.1=1.26

2.05*0.1=0.205

12.6*0.01=0.126

47.15*0.01=0.4715

12.6*0.001=0.0126

506.5*0.001=0.5065

12,6x0,1=1,26

 = 12,6 . ( 1,4 - 1,3 )

= 12,6 . 0,1

= 1,26

\(12,6\times1,4-12,6\times1,3\)
\(\Rightarrow12,6\times\left(1,4-1,3\right)\)
\(\Rightarrow12,6\times0,1\)
\(\Rightarrow1,26\)

\(\text{ 12,6 x 1,4 - 12,6 x 1,3}.\)

\(=12,6\times\left(1,4-1,3\right).\)

\(=12,6\times0,1.\)

\(=1,26.\)

a: =100+10=110

45,6 x 2,5 + 45,6 x 7,5 - ( 12,6 x 4,2 + 12,6 x 5,8)

= 45,6 x ( 2,5 + 7,5 ) - 12,6 x (4,2 +5,8)

= 45,6 x 10 - 12,6 x 10

= 456 + 126

= 582

257,89 x 0,32 + 257,89 x 0,58 + 25,789

= 257, 89 x ( 0,32 + 0,58 ) + 25,789

= 257,89 x 0,9 + 25,789

= 232,101 + 25,789

= 257,89