Bo dau ngoac roi tinh
-25 + ( 38 +26 - 75 ) - ( 38 + 65 -73 )
- ( 28 + 90 + 35 - 76 ) + ( 24 - 83)
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(-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)
27 + 514 - 486 + 73 = 128
10 - 12 - 9 - 1 = - 12
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=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
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
a) 57 + 28 = 85
24 + 67 = 91
46 + 39 = 85
b) 83 - 19 = 64
42 - 38 = 4
90 - 76 = 14
\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{57}\\{28}\end{array}}\\\hline{\,\,\,\,85}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{24}\\{67}\end{array}}\\\hline{\,\,\,\,91}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{39}\end{array}}\\\hline{\,\,\,\,85}\end{array}\)
\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{83}\\{19}\end{array}}\\\hline{\,\,\,\,64}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{42}\\{38}\end{array}}\\\hline{\,\,\,\,04}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{90}\\{76}\end{array}}\\\hline{\,\,\,\,14}\end{array}\)
- 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
\(\text{a) }\left(27+514\right)-\left(486-73\right)\)
\(=27+514-486+73\)
\(=\left(27+73\right)+\left(514-486\right)\)
\(=100+1000\)
\(=1100\)
\(\text{b) }\left(38-29+43\right)-\left(43+28\right)\)
\(=38-29+43-43-28\)
\(=\left(38-28\right)+\left(43-43\right)-29\)
\(=10+0-29\)
\(=10-29\)
\(=-19\)
\(\text{c) }\left(-245-12\right)-\left(18-245\right)\)
\(=-245-12-18+245\)
\(=\left(245-245\right)-\left(12+18\right)\)
\(=0-30\)
\(=-30\)
\(\text{d) }\left(327+414\right)-\left(-586-73\right)\)
\(=327+414+586+73\)
\(=\left(327+73\right)+\left(414+586\right)\)
\(=400+1000\)
\(=1400\)
-25 + ( 38 +26 - 75 ) - ( 38 + 65 -73 )=-66
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