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\(\text{1.-(-66)+34+(-73)-27+99}.\)
\(=66+34-73-27+99=100-100+99=-99.\)
\(\text{2.54-(45-30+54)-30+5}.\)
\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)
\(\text{3.42-56+33-(33-56+42)}.\)
\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)
\(\text{4.50-(47+50-18)+(47-18)}.\)
\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)
\(\text{5.10-(28-30+4)}.\)
\(=10-28+30-4=10+30-20-8-4=20-12=8.\)
\(\text{6.-(-73)+(44-94+27)+94}.\)
\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)
1: =66+34-73-27+99=99
2: =54-45+30-54-30+5=-40
3: =42-56+33-33+56-42=0
4: =50-47-50+18+47-18=0
5: =10-28+30-4=2-4+10=12-4=8
|25 - 24 -10| - (28 - 30 + 4)
= |1 - 10| - (-2 + 4)
= |-9| - 2
= 9 - 2
= 7
-(-73) + (44 - 94 + 27) + 94
= 73 + (-50 + 27) + 94
= 73 + (-23) + 94
= 73 - 23 + 94
= 50 + 94
= 144
(-33 + 108 - 75) - (108 + 25)
= (75 - 75) - 133
= 0 - 133
= -133
120 - (-2 + 120 - 18) - 92
= 120 - (118 - 18) - 92
= 120 - 100 - 92
= 20 - 92
= -72
(478-739)+739
= 478 - 739 + 793
= 793 - 793 + 478
= 00 + 478
= 478
524-(524-213)
= 524 - 524 + 213
= 0 + 213
= 213
(145-342)+(342-45)
= 145 - 342 + 342 - 45
= 342 - 342 +145 - 45
= 00 + 145 - 45
= 100
(-75+94)-(25+94)
= -75 + 94 - 25 - 94
= 94 - 94 - 75 - 25
= 00 - 75 - 25
= -100
a.-7264+(1543+7364)
=-7264+1543+7364
=-7264+7364+1543
=100+1543
=1643
những câu sau tương tự
a) (27+514)-(486-73)
=27+514-486+73
=541-486+73
=55+73
=128
b) (36+79)+(145-79-36)
=36+79+145-79-36
=115+145-79-36
=260-79-36
=181-36
=145
c) 10-[12-(-9-1)]
=10-12+(-9)+(-1)
=(-2)+(-9)+(-1)
=(-11)+(-1)
=-12
tick nha bạn
tham khảo
1/ -7264 + (1543 + 7264)
= -7264 + 7264 + 1543
= 0 + 1543 = 1543
2/ (144 - 97) - 144
= 144 - 144 - 97
= 0 - 97 = -97
3/ -145 - (18 - 145)
= -145 + 145 - 18
= 0 - 18 = 18
4/ 111 + (-11 + 27)
= 111 - 11 + 27
= 100 + 27 = 127
5/ (27 + 514) - (486 - 73)
= 27 + 514 - 486 + 73
= 27 + 73 + 514 - 486
= 100 + 28
= 28
6/ (36 + 79) + (145 - 79 - 36)
= 36 + 79 + 145 - 79 - 36
= 36 - 36 + 79 - 79 + 145
= 145
7/ 10 - [12 - (-9 - 1)]
= 10 - (12 + 9 + 1)
= 10 - (12 + 10)
= 10 - 10 - 12
= -12
8/ (38 - 29 + 43) - (43 + 38)
= 38 - 29 + 43 - 43 - 38
= 38 - 38 + 43 - 43 - 29
= -29
9/ 271 - [(-43) + 271 -(-17)]
= 271 - (-43 + 271 + 17)
= 271 + 43 - 271 - 17
= 43 - 17 = 26
10/ -144 - [29 - (+144) - (+144)]
= -144 - 29 + 144 + 144
= -29 + 144
= 115
5/ (27 + 514) - (486 - 73)
= 27 + 514 - 486 + 73
= 27 + 73 + 514 - 486
= 100 + 28
= 28
câu này là 128 nhé
\(\left(27+55\right)+\left(345-27-55\right)\)
\(=27+55+345-27-55\)
\(=\left(27-27\right)+\left(55-55\right)+345\)
\(=0+0+345\)
\(=345\)
\(38.65+38.50-38.15\)
\(=38.\left(65+50-15\right)\)
\(=38.100\)
\(=3800\)
\(\left(123-60\right)-\left(2017-60+123\right)\)
\(=123-60-2017+60-123\)
\(=\left(123-123\right)-\left(60-60\right)-2017\)
\(=0-0-2017\)
\(=-2017\)
Bỏ dấu ngoặc rồi tính:
(27 + 55 ) + ( 345 - 27 - 55 )
= 27 + 55 + 345 - 27 - 55
= (27-27) + (55-55) + 345
= 0 + 0 + 345
= 345
Tính nhanh:
38.65 + 38.50 - 38.15
= 38.(65+50-15)
= 38.100
= 3800
Bỏ ngoặc rồi tính:
( 123 - 60 ) - ( 2017 - 60 + 123 )
= 123 - 60 - 2017 + 60 - 123
= (123-123) + (60-60) - 2017
= 0 + 0 - 2017
= 0 - 2017
= -2017
f -7264+(1543+7264)
=-7264+1543+7264
=[(-7264+7264)+1543
=0+1543
=1543
g(-145)-(18-145)
=(-145)-18+145
=[(-145+145)]-18
=0-18
-18
nhớ tick nhé
- ( 73 ) + ( 44 - 94 + 27 ) + 94
= -73 + 44 - 94 + 27 + 94
=( -73 + 44 + 27 ) + ( -94 + 94 )
= -2 + 0 = -2
- 73 + ( 44 - 94 + 27 ) + 94
= - 73 + 44 - 94 + 27 + 94
= ( 94 - 94 ) + ( - 73 + 27 ) + 44
= 0 + ( - 46 ) + 44
= - 2