5/6 x 102/100 - 5/6 x 2/100 =

17/10 - 1/60                         =

101/60

thuận tiết nhất bn ơi

=445

\(2005-5+5+5+...+5+5\)

\(=2005-5+\left(5+5+...+5\right)\)

\(=2005-5+50\)

\(=2000+50=2050\)

PP/ss: Chắc z ((:

5×(1009+2010)+(-2010)×5

\(=\dfrac{5\left(107+1-8\right)}{5}=107+1-8=100\)

= 5 x 107 + 5 x 1 - 5 x 8/ 5 x 1

= 5 x ( 107+1-8)/ 5 x 1

= 5 x 100/5 x 1

= 1 x 100/ 5 x 1

= 100

100

a: 34/56=17/28=1-11/28

42/53=1-11/53

mà 11/28>11/53

nên 34/56<42/53

b: 5/4=15/12; 7/6=14/12; 5/6=10/12

=>5/4>7/6>5/6

c: 4/3>1>99/100

a)S

b)Đ

c)S

 Đúng ghi Đ, sai ghi S vào ô trống:

a) 5 × 113 - 5 × 13 = 5 × (113 – 13) = 5 × 100 = 50            S

b) 5 × 113 - 5 × 13 = 5 × (113 – 13) = 5 × 100 = 500            Đ

c) 5 × 113 - 5 × 13 = 5 × (113 – 13) × 5 = 5 × 100 × 5 = 2500        S

Đáp án/:

A/. Sai ( S )

B/. Đúng ( Đ )

C/. Sai ( S )

=(1-2)+(3-4)+...+(99-100)+101

=(-50)+101

=51

$1-2+3-4+5-6+.....+97-98+99-100+101$

$= (1-2) + (3-4) + (5-6) + ...... + (99-100) + 101

$= (-50) + 101$

$= 51$

\(\frac{5}{2}+\frac{5}{4}+\frac{5}{8}+\frac{5}{16}+\frac{5}{32}+\frac{5}{64}+\frac{5}{128}+\frac{5}{256}\)

\(\Rightarrow5-\frac{5}{2}+\frac{5}{2}-\frac{5}{4}+\frac{5}{4}-\frac{5}{8}+\frac{5}{8}-\frac{5}{16}+...+\frac{5}{128}-\frac{5}{256}\)

\(\Rightarrow5-\frac{5}{256}\)

\(\Rightarrow\frac{1275}{256}\)

KQ 1275/256

cảm ơn nhé

giải mình bài này xong mình k cho

Ta có 5/2 + 5/4 + 5/8 + 5/16 + 5/32 + 5/64 + 5/128 + 5/256

= 5- 5/2  + 5/2 - 5/4  + 5/4 - 5/8 + 5/8 - 5/16 + 5/16 - 5/32  + 5/32 - 5/64 + 5/64 - 5/128 + 5/128 - 5/256

= 5-5/256

= 1275/256