\(\text{#}HaimeeOkk\)

A) \(12,4×(72,53+27,47)\)

\(=12,4×100\)

\(=1240\)

\(B)(32,42+17,58)+10,49\)

\(=50+10,49 \)

\(=60,49\)

A. 12,4 . 72,53 + 27,47 . 12,4

= 12,4 (72,53 + 27,47)

= 12,4 . 100

= 1240

B. 32,42 + 10,49 + 17,58

= ( 32,42+17,58 ) + 10,49

= 50 + 10,49

=  60,49

_HT_

1240

60.49

tik mik nha

1) 12,4x72,53+27,47x12,4

= 12,4x(72,53+27,47)

= 12,4 x 100

=1240

2) 32,42+ 10,49+ 17,58

= (32,42+17,58) + 10,49

= 50 + 10,49

= 60,49

28,37-23,18-16,82+71,63
=(28,37+71,63)-(23,18+16,82)

=60

B=1/1x6 + 1/6x11 + 1/16x21 + 1/21x26 + 1/26x31

=1-1/6+1/6-1/11+1/11-....-1/31

=1-1/31=30/31

a) A = \(\left(28,37+71,63\right)-\left(23,18+16,82\right)\)

= 100 - 40

= 60

b) \(B=\dfrac{1}{1.6}+\dfrac{1}{6.11}+\dfrac{1}{11.16}+\dfrac{1}{16.21}+\dfrac{1}{21.26}+\dfrac{1}{26.31}\)

= \(\dfrac{1}{5}\left(\dfrac{5}{1.6}+\dfrac{5}{6.11}+...+\dfrac{5}{26.31}\right)\)

= \(\dfrac{1}{5}\left(1-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{11}+...+\dfrac{1}{26}-\dfrac{1}{31}\right)\)

= \(\dfrac{1}{5}\left(1-\dfrac{1}{31}\right)=\dfrac{1}{5}.\dfrac{30}{31}=\dfrac{6}{31}\)

3,42+10,49+17,58

=(3,42+17,58)+10,49

=21+10,49

=31,49

17,6-5,3-7,6+15,3-6,8

=(17,6-7,6)+(15,3-5,3)-6,8

=10+10-6,8

=20-6,8

=13,2

8,99+8,98+8,96+0,1

=(8,99+0,1)+8,98+8,96

=9+17,94

=26,94

.

8,99+8,98+8,97+9,96+0,1.

=9+26,91

=35,91

~ sorry ~

17.58 x 43 + 17.58 x 56 + 1.758 x 10

= 17.58 x (43 + 56) + 1.758 x 10

= 1740.42 + 17.58

= 1758

17,58 x 43 + 17,58 x 56 + 1,758 x 10

= 17,58 x 43 + 17,58 x 56 + 17,58

= 17,58 x (43 + 56 + 1)

= 17,58 x 100

= 1758

\(50\%+\dfrac{7}{12}-\dfrac{1}{2}\)

\(=\dfrac{1}{2}+\dfrac{7}{12}-\dfrac{1}{2}\)

\(=\left(\dfrac{1}{2}-\dfrac{1}{2}\right)+\dfrac{7}{12}\)

\(=\dfrac{7}{12}\)

_______________

\(2022\cdot67+2022\cdot43-2022\cdot10\)

\(=2022\cdot\left(67+43-10\right)\)

\(=2022\cdot100\)

\(=202200\)

_____________________

\(10,3+6,9+8,7+13,1\)

\(=\left(13,1+6,9\right)+\left(10,3+8,7\right)\)

\(=20+19\)

\(=39\)

___________________

\(17,58\times43+57\times17,58\)

\(=17,58\times\left(43+57\right)\)

\(=17,58\times100\)

\(=1758\)

tớ ghi sai nên cập nhật lại câu hỏi, phần 3 các bạn trả lời sớm mà bị sai thì bỏ qua cho tớ nhé

17,58 x 43 + 57 x 17,58

          = 17,58 x 43 + 17,58 x 57 (tính giao hoán)

         = 17,58 x (43 + 57) = 17,58 x 100 = 1758 (nhân 1 số với 1 tổng)

a, 17,58 x 43 + 57 x 17,58

= 17,58 x 43 + 17,58 x 57 (tính giao hoán)

= 17,58 x (43 + 57) = 17,58 x 100 = 1758 (nhân 1 số với 1 tổng)

b, 43,57 x 2,6 x (630 – 315 x 2)

= 43,57 x 2,6 x (630 – 630)

= 43,57 x 2,6 x 0 = 0

a,   17,58-6,35-5.65=17,58-(6,35+5.65)=17,58-12=5,58

b,    513,76-62,8+49,04

       =(513,76+49,04)-62,8

      =562,8-62,8=500

k cho mình nha bạn!

a; 17,58-6,35-5,65=17,58-(6,35+5,65)=17,58-12=5,58

b;513,76-62,8+49,04=513,76+49,04-62,8=562,8-62,8=500