Bo dau ngoac roi tinh
-25 + ( 38 +26 - 75 ) - ( 38 + 65 -73 )
- ( 28 + 90 + 35 - 76 ) + ( 24 - 83)
Bo dau ngoac roi tinh
(-233) + (-25 + 233) - (-100 + 75)
115 - (374 + 115) + (-65 + 374)
(-233) + (-25 + 233) - (-100 + 75)
= -233 + (-25) + 233 + 100 - 75
= -233 -25 + 233 + 100 -75
=(-233+233)-25+100-75
=0-25+100-75
=0
(-233)+(-25+233)-(-100+75)
=(-233)+(-25)+233-(-100)-75
=(-233+233)+(-25-75)-(-100)
=(-100)-(-100)
=(-100)+100
=0
115-(374+115)+(-65+374)
=115-374-115+(-65)+374
=(115-115)+(-374+374)+(-65)
=0+0+(-65)
=(-65)
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20 * 21 * 22 * 23 * 24 * 25 * 26 * 27 * 28 * 29 * 30 * 31 * 32 * 33 * 34 * 35 * 36 * 37 * 38 * 39 * 40 * 41 * 42 * 43 * 44 * 45 * 46 * 47 * 48 * 49 * 50 * 51 * 52 * 53 * 54 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
[27+514]-[486-73]
10-[12-[-9-1]]
[38-29+43]-[43+38]
271-[[-43]+271-[-17]]
-144-[29-[+144]-[+144]]
bo ngoac roi tinh
27 + 514 - 486 + 73 = 128
10 - 12 - 9 - 1 = - 12
Tk mik mik làm nốt cho
Mik mới bị trừ 50 chục điểm bùn qúa T_T
[27 + 514] - [486 - 73]
= 27 + 514 - 486 + 73
= (27 + 73) + ( 514 - 486)
= 100 + 28
= 128
10 - [12 - [-9 -1]]
= 10 - 12 - 9 - 1
= -12
[38 - 29 + 43] - [43 + 38]
= 38 - 29 + 43 - 43 - 38
= (38 - 38) - 29 + (43 - 43)
= 0 - 29 + 0 = -29
Bo dau ngoac roi tinh
(27+65)+(346-27-65)
(42-69+17)-(42+17)
bạn lấy máy tính ra bấm nhé
tick mik nha bạn Quỳnh Anh dễ thương
=27+65+346-27-65
=(27-27)+(65-65)+346
=0+0+346
=346
b)=42-69+17-42-17
=(42-42)+(17-17)-69
=0+0-69
=-69
bo dau ngoac roi tinh: a) (27+65)+(346-27-65) ;b)(42-69+17)-(42+17)
a/ (27 + 65) + (346 - 27 - 65)
= 27 + 65 + 346 - 27 - 65
= (27 - 27) + (65 - 65) + 346
= 346
b/ (42 - 69 + 17) - (42 + 17)
= 42 - 69 + 17 - 42 - 17
= (42 - 42) + (17 - 17) - 69
= -69
a)(27+65)+(346-27-65)
= 27+65+ 346-27-65
= (27-27)+(65-65)+346
= 346
b) ( 42-69+17)-(42+17)
= 42-69+17 - 42-17
= ( 42-42) +( 17-17)- 69
= -69
Đặt tính rồi tính.
a) 57 + 28 24 + 67 46 + 39
b) 83 – 19 42 – 38 90 – 76
a) 57 + 28 = 85
24 + 67 = 91
46 + 39 = 85
b) 83 - 19 = 64
42 - 38 = 4
90 - 76 = 14
\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{57}\\{28}\end{array}}\\\hline{\,\,\,\,85}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{24}\\{67}\end{array}}\\\hline{\,\,\,\,91}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{39}\end{array}}\\\hline{\,\,\,\,85}\end{array}\)
\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{83}\\{19}\end{array}}\\\hline{\,\,\,\,64}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{42}\\{38}\end{array}}\\\hline{\,\,\,\,04}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{90}\\{76}\end{array}}\\\hline{\,\,\,\,14}\end{array}\)
1 tính nhanh
a,29 + 132 + 237 + 868 + 763
b, 652+327+148+15+73
c, 35 . 24 + 35 . 38 +65 .75 +45 .65
d, 3 .25 +4 . 37 . 6 +2 . 38 .12
Chú ý :Dấu chấm là dấu nhân nhé các bạn
- Giải:
a) 29 + ( 132 + 868 ) + ( 237 + 763 )
= 29 + ( 1000 + 1000 )
= 29 + 2000 = 2029
b) 652 + 327 + 148 + 15 + 73
= ( 652 + 148 ) + ( 327 + 73 ) + 15
= ( 800 + 400 ) + 15 = 1215
-------Phần còn lại nhờ mấy bn khác lm hộ nhé-------
a) 29 + 132 + 237 + 868 + 763
= 29 + (132 + 868) + (237 + 763)
= 29 + 1000 + 1000
= 2029
b) 652 + 327 + 148 + 15 + 73
= (652 + 148) + (327 + 73) + 15
= 800 + 400 + 15
= 1215
c) 35 . 24 + 35 . 38 + 65 . 75 + 45 . 65
= 35(24 + 38) + 65(75 + 45)
= 35 . 62 + 65 . 120
= 5 . 7 . 2 . 31 + 65 . 12 . 10
= 10 . 7 . 31 + 65 . 12 .10
= 10(7 . 31 + 65 . 12)
= 10(217 + 780)
= 10 . 997
= 9970
d) 3 . 25 + 4 . 37 . 6 + 2 . 38 . 12
= 3 . 25 + 4 . 37 . 2 . 3 + 2 . 38 . 12
= 3 . 25 + 12 . 37 . 2 + 2 . 38 . 12
= 3 . 25 + 12 . 2(37 + 38)
= 3 . 25 + 12 . 2 . 75
= 3 . 25 + 12 . 2 . 3 . 25
= 3 . 25(1 + 12 . 2)
= 3 . 25 . 25
= 1875
a)29+132+237+868+763
=(132+868)+(237+763)+29
= 1000 + 1000 +29
= 2029
b)652+327+148+15+73
=(652+148)+(327+73)+15
=800+400+15
=1215
c)35x24+35x38+65x75+45x65
=35x(24+38)+65x(75+45)
=35x62+65x120
=2170+7800
=9970
d)3x25+4x37x6+2x38x12
=3x25+24x37+24x38
=3x25+24(37+38)
=75+24x75
=75(1+24)
=75x25
=1875
Bai 4.5 : Bo ngoac roi tinh
a) (27+514) - ( 486 - 73)
b) ( 38 - 29 + 43 ) - ( 43 + 28)
c) (- 245 - 12 ) - ( 18 - 245 )
d) ( 327 + 414 ) - ( - 586 - 73 )
GIUP MINH NHA , SAP NOP RUI !
\(\text{a) }\left(27+514\right)-\left(486-73\right)\)
\(=27+514-486+73\)
\(=\left(27+73\right)+\left(514-486\right)\)
\(=100+1000\)
\(=1100\)
\(\text{b) }\left(38-29+43\right)-\left(43+28\right)\)
\(=38-29+43-43-28\)
\(=\left(38-28\right)+\left(43-43\right)-29\)
\(=10+0-29\)
\(=10-29\)
\(=-19\)
\(\text{c) }\left(-245-12\right)-\left(18-245\right)\)
\(=-245-12-18+245\)
\(=\left(245-245\right)-\left(12+18\right)\)
\(=0-30\)
\(=-30\)
\(\text{d) }\left(327+414\right)-\left(-586-73\right)\)
\(=327+414+586+73\)
\(=\left(327+73\right)+\left(414+586\right)\)
\(=400+1000\)
\(=1400\)
a) (27+514)-(486-73)
= 27 + 514 - 486 + 73
= ( 27+ 73 ) + ( 514 - 486 )
= 100 + 1000
= 1100
rut gon roi quy dong va phan so
34 phan 5i va 38 phan 95 msc
54 phan 36 va 26 phan 39 msc
42 phan 28 va 27 phan 45 msc
33 phan 25 va 25 phan 75 msc
21 phan 35 va 18 phan 24 msc
33 phan 77 va 25 phan 75
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