ghi ra giấy giú mình nhé . Thank you mọi người

a, 2217

b, 8000

c, -11777.88764

d, \(-\dfrac{7}{26}\)

a) (-124) + 24 = -100
b) 37. 78 + 37. 22
=  37 . ( 78 + 22 )
=  37 . 100
= 3700

\(a) (-124) + 24 = -100 b) 37. 78 + 37. 22 = 37 . ( 78 + 22 ) = 37 . 100 = 3700\)

a) (- 124) + 24                                          b) 37 . 78 + 37 . 22

= - ( 124 - 24)                                              =37 . ( 78 + 22)

= - 100                                                        =37 . 100 

                                                                    3700

\(a,38+41+117+159+62\\ =\left(38+62\right)+\left(41+159\right)+117\\ =100+200+117\\ =300+117\\ =417.\\ b,73+86+914+3032\\ =73+1000+3032\\ =1073+3032\\ =5150.\\ c,314.67+314.16+659.83\\ =314.\left(67+16\right)+659.83\\ =314.83+659.83\\ =83.\left(314+659\right)\\ =83.937\\ =?\)

Bn xem lại phần \(c,\) .

\(d,42.53+47.156-47.114\\ =42.53+47.\left(156-114\right)\\ =42.53+47.42\\ =42.\left(53+47\right)\\ =42.100\\ =4200.\)

a) \(38+41+117+159+62=(38+62)+(41+159)+117 \)

\(=100+200+117 =300+117 =417\)

b) \(73+86+968+914+3032=(86+914)+(968+3032)+73\)

\(=1000+4000+73=5073\)

c) \(341.67+341.16+659.83 =341.(67+16)+659.83 =341.83+659.83\)

\(=83.(341+659) =83.1000=83000\)

d) \(42.53+47.156-47.114 =42.53+47(156-114) =42.53+47.42 =42.(53+47)=42.100=4200\)

Lời giải:

$10+2.4^2=10+2.16=10+32=42$

Đáp án A

$50-4.3^2=50-4.9=50-36=14$

Đáp án A.

Bài 2: Tính nhanh

a) 29 + 132 + 237 + 868 + 3

 = 29+(132+858)+(237+3)

=29+990+240

=1259

29+132+237+868+3

29+(132+868)+(237+3)

29+1000+240

29+(1000+240)

29+1240

1269

bài 2 :

a) 29 + 132 + 237 + 868 + 3

= 29 +(132 + 868)+(237 + 3)

= 29 + 1000 + 240

=1269

b) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 5
= 35 .(34 + 86)+ 65 .(75 + 5)

= 35 . 120 + 65 . 80

= 4200 + 5200

= 9400

c) 3 . 25 . 8 + 4 . 37 . 6 + 2 . 38 .12

khum bít làm hehe

d) 12 . 53 + 53 . 172 - 53 . 84

= 53 . (12 + 172 - 84)

= 53 . 100

= 5300

Bài 3:

a) 4 . 52 - 18 : 32 hình như câu này sai đề

b) 32 . 22 - 32 . 19

= 32 . (22 - 19)

= 32 . 3

= 96

a: =(-23+23)+230=230

b: =54(-124+24)=-5400

c: =-927+930=3

d: =(-351+51)+(-74-126)-149=-300-200-149=-649

e: \(=\dfrac{3^3\cdot\left(2^3+2^2+1\right)}{13}=3^3=27\)

\(a,=\left[\left(-23\right)+23\right]+230=0+230=230\\ b,=\left(-124\right).54+24.54\\ =54.\left[\left(-124\right)+24\right]=54.\left(-100\right)=-5400\)

a) (-23) + 230 + 23

=([-23] + 23) + 230

=0+230

=230

b)124. (-54) + 24 . 54

= ([-54 + 54]) + (124 + 24)

=0 + 48

=48

Đây chỉ là tham khảo, nếu có si sót thì xin lỗi 

Cảm ơn!

a)5.(-8).2.(-3)

=[5.(-2)].[(-8).(-3)]

=-10.24

=-240

b)(45-135+72)-(45+72)

=45-135+72-45-72

=(45-45)+(72-72)-135

=0+0-135

=-135

c)3.(-5)².2+2.(-5)-20

=3.25.2+2(-5)-20

=75.2+(-10)-20

=150+(-30)

=120

d)86.(-46)+46.27-46.41

=86.(-1).46+46.27-46.41

=-86.46+46.27-46.41

=46(-86+27-41)

=46(-100)

-4600

e)34(15-10)-15(34-10)

=34.15-34.10-15.34+15.10

=(34.15-15.34)+(15.10-34.10)

=[34(15-15)]+[10(15-34)]

=34.0+10(-9)

=0+(-90)

=-90

a: 86+357+14

=100+357

=457

b: \(3\cdot52-16:22\)

\(=156-\dfrac{8}{11}=\dfrac{1708}{11}\)

c ) 86 . 47 - 86 . 17 + 30 . 14

= 86 . ( 47 - 17 ) + 30 . 14

= 86 . 30 + 30 . 14

= 30 . ( 86 + 14 ) 

= 30 . 100

= 3000

a/ \(\left(-27\right)+|-227|+\left(-84\right).\)

\(=\left(-27\right)+227+\left(-84\right)\)

\(=200+\left(-84\right)=116\)

b/ \(=2017+\left(729+\left(-1008\right)\right)\)

\(=2017+\left(-279\right)=1738\)

c/ \(=86.\left(47-17\right)+30.14\)

\(=80.30+30.14\)

\(=30.\left(80+14\right)\)

\(=30.94=2820\)

Nhớ k cho mình nhé! Thank you!!!

a ) ( - 27 ) + I - 227 l + ( - 84 )

= ( - 27 ) + 227 + ( - 84 )

= 200 + ( - 84 )

= 116