A) 325 + 612 + 675 + 388

= ( 325 + 612 ) + ( 675 + 388 )

=  937 + 1063

= 2000

 B) 268 x 8 + 315 x 33 + 315

= ( 268 x 8 ) + ( 315 x 33 ) + 315

= 2144 + 10395 + 315

= 12539 + 315

= 12854

 C) 315 x 66 + 315 x 33 + 325

= ( 315 x 66 ) + ( 315 x 33 ) + 325

= 20790 + 10395 + 325

= 31185 + 325

= 31510

 D) 2017 x 19 - 2017 x 8 - 2017

= ( 2017 x 19 ) - ( 2017 x 8 ) - 2017

=38323 - 16136 -2017

= 22187 - 2017

= 20170

 E) 3150 - 267 - 315 - 733 - 685

= ( 3150 - 267 ) - 315 - ( 733 - 685 )

= 2883 - 315 - 48

= 2568 - 48

= 2520

\(2\)x\(4\)x\(8\)x\(5\)x\(25\)x\(125\)

=(2x5)x(4x25)x(8x125)

=10x100x1000

=1000000

2x4x8x5x25x125 = ( 2 x 5 ) x ( 4 x 25 ) x ( 8 x 125 )

     = 10 x 100 x 1000

      = 1000000

Chúc bạn học tốt và đạt điểm cao ❤

bài tập tết

giúp mình với

a) 675+125+723-23

=(675+125)+(723-23)

=800+700

=1500

b) 325.40+325.60-25.100

=325.(40+60)-25.100

=325.100-25.100

=100.(325-25)

=100.300

=30000

c) 80+[37-(32+23)]

=80+(37-55)

=80-18

=62

d) 22.85+15.22-20200

=22.(85+15)-20200

=22.100-20200

=2200-20200

=-18000

\(\frac{2}{15}+\frac{2}{35}+\frac{2}{63}+....+\frac{2}{575}+\frac{2}{675}\)

\(=\frac{2}{3\times5}+\frac{2}{5\times7}+\frac{2}{7\times9}+...+\frac{2}{23\times25}+\frac{2}{25\times27}\)

\(=\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{23}-\frac{1}{25}+\frac{1}{25}-\frac{1}{27}\)

\(=\frac{1}{3}-\frac{1}{27}=\frac{8}{27}\)

Vậy ....

\(\frac{2}{15}+\frac{2}{35}+\frac{2}{69}+........+\frac{2}{575}+\frac{2}{675}\)

\(=\frac{2}{3\times5}+\frac{2}{5\times7}+........+\frac{2}{23\times25}+\frac{2}{25\times27}\)

\(=\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+.......+\frac{1}{23}-\frac{1}{25}+\frac{1}{25}-\frac{1}{27}\)

\(=\frac{1}{3}-\frac{1}{27}\)

\(=\frac{8}{27}\)

675:8

= 84 dư 3

bạn nhé

tk mình nha

Cảm ơn bạn rất nhiều

= 84 dư 3

\(\frac{20}{11}\cdot\frac{33}{23}\cdot\frac{69}{180}\)

\(=\frac{20\cdot33\cdot69}{11\cdot23\cdot180}\)

\(=\frac{20\cdot3\cdot11\cdot23\cdot3}{11\cdot23\cdot20\cdot3\cdot3}\)

\(=1\)

bài b bạn xem lại đề nha

54= 2.3³

Ư(54)= {1; 2; 3; 6; 9;18; 27; 54}

68=2².17

Ư(68)= {1; 2; 4; 17; 34; 68}

35=5.7

Ư(35)= {1; 5; 7; 35}

70=2.5.7

Ư(70)= {1; 2; 5; 7; 10; 14; 35; 70}

23=1.23

Ư(23)= {1; 23}

657=3³.5²

Ư(675)= {1; 3; 5; 9; 15; 25; 27; 45; 75; 135; 225; 675}

890=2.5.89

Ư(890)= {1; 2; 5; 10; 89; 178}

54=2.3³

Ư(54)={1; 2; 3; 6; 9; 18; 27; 54}

68=2².17

Ư(68)={1; 2; 4; 17; 34; 68}

35=5.7

Ư(35)={1; 5; 7; 35}

70=2.5.7

Ư(70)={1; 2; 5; 7; 10; 14; 35; 70}

23=1.23

Ư(23)={1.23)

675=3³.5²

Ư(675)={1; 3; 5; 9; 15; 25; 27; 45; 75; 135; 225; 675}

890=2.5.89

Ư(890)={1; 2; 5; 10; 89; 178; 445; 890}

giải giúp mình với