vcl acc bb cua tau 21 tank

Đ/S : 399,1153846

Bài 1:

a, 35 + 28 - 42 - 35 - 28

= (35 - 35) + (28 - 28) - 42

= -42

b, 55 +56 +57 +58 +59 -28 -26 -25 -29 -27

=(55-25)+(56-26)+(57-27)+(58-28)+(59-29)

= 30 + 30 + 30 + 30 + 30

= 150

Bài 2:

a, -1983 - (325 - 1983)

= -1983 - 325 + 1983

= -325

b, -549 + (321 + 549)

= -549 + 321 + 549

= 321

c, 54 - (-65 + 98 - 15)

= 54 + 65 - 98 + 15

= 36

d, (67 + 23) - (56 - 32 + 46)

= 67 + 23 - 56 + 32 - 46

= 20

e, 24 - [ 15 - (42 - 18) ]

= 24 - [ 15 - 42 + 18 ]

= 24 - (-9)

= 33

f, (63 - 21 + 84) - (49 - 36 + 87)

= 63 - 21 + 84 - 49 + 36 - 87

= 26

g, 284 - [ (214 - 168) - (865 - 987) ]

= 284 - [ 214 - 168 - 865 + 987 ]

= 284 - 168

= 116

h, 654 + [ (545 - 726) - (321 - 465) ]

= 654 + [ 545 - 726 - 321 + 465 ]

= 654 + (-37)

= 617

Chúc bạn học tốt !

vừa dễ vừa dài bome bấm máy tính đi man

256,23 + 12,56 = 268,79

56,23 + 12,45 = 68,68

89,67 - 23,45 = 66,22

1,23 + 34,67 = 35,9

19,56 + 45,65 = 65,21

kp voi : http://olm/thanhvien/gop123 va mih dj

a) 22+36=58     96−32=64     62−30=32

89−47=42     44+44=88     45−5=40

\(A=1-1-\dfrac{5}{6}+1+\dfrac{7}{12}-1-\dfrac{9}{20}+1+\dfrac{11}{30}-1-\dfrac{13}{42}+1+\dfrac{15}{56}-1-\dfrac{17}{72}+1+\dfrac{19}{90}\)

\(=1-\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}+\dfrac{1}{4}-\dfrac{1}{4}-\dfrac{1}{5}+...+\dfrac{1}{9}+\dfrac{1}{10}\)

=1/2+1/10

=5/10+1/10=6/10=3/5

a,  15 . { 32 : [ 6 - 5 + 5 ( 9 : 3 ) ] + 3 } - 2018 0

= 15.{32:[1+15]+3}–1

= 15.5–1

= 74

b,  25 . { 2 7 : [ 12 - 4 + 2 2 . 16 : 2 3 ] - 2 4 }

= 25.{128:[8+4.2]–16}

= 25.24

= 600

c,  2019 . { 101 - 1000 : [ 2 2 . 2 3 + 5 6 : 5 3 - 6 2 : 11 - 2018 0 ] }

= 2019.{101–1000:[(32+125–36):11–1]}

= 2019.{101–1000:[121:11–1]}

= 2019.{101–1000:10}

= 2019.1

= 2019

a) \(\left(-17\right)\cdot32+17\cdot\left(-68\right)-17\)

\(=17\cdot\left(-32-68-1\right)\)

\(=17\cdot\left(-101\right)\)

\(=17\cdot\left(-100-1\right)\)

\(=-1700-17\)

\(=-1717\)

b) \(25\cdot\left(34-89\right)+25\cdot89\)

\(=25\cdot\left(34-89+89\right)\)

\(=25\cdot34\)

\(=850\)

c) \(-145\cdot\left(13-57\right)+57\cdot\left(10-145\right)\)

\(=-145\cdot13+145\cdot57+57\cdot10-145\cdot57\)

\(=-145\cdot\left(13+57\right)+57\cdot\left(145+10\right)\)

\(=-145\cdot70+57\cdot155\)

\(=-10150+8835\)

\(=-1315\)

`@` `\text {Ans}`

`\downarrow`

`a)`

\((- 17) . 32 + 17 . (- 68) – 17 \)

`= (-17). (32 + 68 + 1) `

`= (-17). 101`

`= -1717`

`b)`

\(25 . (34 – 89) + 25 . 89\)

`= 25. (34 - 89 + 89)`

`= 25. 34`

`= 850`

`c)`

\(– 145. (13 – 57) + 57. (10 – 145)\)

`= (-145). 13 - (-145). 57 + 57.10 + 57. (-145)`

`= (-145). (13 - 57 + 57) + 57.10`

`= (-145). 13 + 570`

`= -1885 + 570 = -1315`

x - 56 = 89 + 32 + 67

x - 56 = 188 

x       = 188 + 56

x       = 244

t mk nha bạn

x - 56 = 89 + 32 + 67

x - 56 = 188

x = 188 + 56

x = 244