\(\left(3^{15}.4+5.3^{15}\right):3^{16}=3^{15}.\left(4+5\right):3^{16}=3^{15}.9:3^{16}=3^{15}.3^2:3^{16}=3^{15+2-16}=3^1=3\)

-(315.4+275)+4.135-(10-275)

=-1535+540+265

=-730

= 4(25 + 32 + 39 + 46 + 53)

= 4 . 195

= 780

k giùm

=4(25+32+39+46+53)

=780

= 4.(25+32+46+39+53)

=4.195

= 780

TICK CHO MÌNH NHA

  2 .18 .14 + 3 .12.17- 4 .31. 9

= 504 + 612 - 1116

= 0

 2 .18 .14 + 3 .12.17- 4 .31. 9= 504 + 612 - 1116= 0

2.18.14+3.12.17-4.31.9

=36.14+36.17-36.31

=36.(17+14-31)

=36.0

=0

A,= -315.4-275+4.315-10+275

=[(-315.4)+4.315]+(-275+275)-10

=-10

b,=[(-2,5.0,4).0,375]-[(-8.0,125).3,25]

=[-1.0,375]-[(-1).3,25]

=-0,375-(-3,25)

=-0,375+3,25=2,875

\(100:\left\{250:\left[450-\left(4\cdot5^3-2^2\cdot25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(4\cdot125-4\cdot25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)

\(=100:\left[250:\left(450-400\right)\right]\)

\(=100:\left(250:50\right)\)

\(=100:5\)

\(=20\)

100:{250:[450−(4⋅53−22⋅25)]}

$=100:\left\{250:\left[450-\left(4\cdot 125-4\cdot 25\right)\right]\right\}$

$=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}$

$=100:\left[250:\left(450-400\right)\right]$

$=100:\left(250:50\right)$

$=100:5$

$=20$

a: =16*20=320

b: =2/3+1/3*1/6:2/3

=2/3+1/18*3/2

=2/3+3/36

=2/3+1/12

=9/12=3/4