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1) 40 + 15 + (-10) + (-15) 2) -13 + (-750) + (-17) + 750 3) (35 - 17) + (17 + 120 - 35)
= 40 + 15 - 10 - 15 = -13 - 750 - 17 + 750 = 35 - 17 + 17 + 120 - 35
= (40 - 10) + (15 - 15) = (-13 - 17) + (-750 + 750) = (35 - 35) + (-17 + 17) + 120
= 30 = -30 = 120
4) (55 + 45 + 15) - (15 - 55 + 45) 5) -(12 + 21 - 23) - (23 - 21 + 10) 6) (2020 - 79 + 15) - (-79 + 15)
= 55 + 45 + 15 - 15 + 55 - 45 = -12 -21 + 23 - 23 + 21 - 10 = 2020 - 79 + 15 + 79 - 15
= (45 - 45) + (15 - 15) + (55 + 55) = (-12 - 10) + (-21 + 21) + (23 - 23) = 2020 + (-79 + 79) + (15 - 15)
= 110 = -22 = 2020
7) -(515 - 80 + 91) - (2010 + 80 - 91) 8) 25 - (-17) + 24 - 12 9) 235 - (34 + 135) - 100
= -515 + 80 - 91 - 2010 - 80 + 91 = 25 + 17 + 24 - 12 = 235 - 34 - 135 - 100
= (-515 -2010) + (80 - 80) + (-91 + 91) = 54 = -34
= -2525
10) (13 + 49) - (13 - 135 + 49)
= 13 + 49 - 13 + 135 - 49
= (13 - 13) + (49 - 49) +135
= 135
a: \(\left(24-234\right)+\left(234-24-77\right)\)
\(=24-234+234-24-77\)
\(=\left(24-24\right)+\left(234-234\right)-77\)
=0+0-77
=-77
b: \(\left(13-135+49\right)-\left(13+49\right)\)
\(=13-135+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-135\)
=0+0-135
=-135
c: \(159-524-\left(59-424\right)\)
\(=159-524-59+424\)
\(=\left(159-59\right)-\left(524-424\right)\)
=100-100
=0
d: \(\left(36+79\right)+\left(145-79-36\right)\)
\(=36+79+145-79-36\)
\(=\left(36-36\right)+\left(79-79\right)+145\)
=0+0+145
=145
e: \(334-\left(117+234\right)+\left(42+117\right)\)
\(=334-117-234+42+117\)
\(=\left(334-234\right)+\left(117-117\right)+42\)
=100+0+42
=142
f: \(271-\left[\left(-43\right)+271-\left(-17\right)\right]\)
\(=271+43-271+\left(-17\right)\)
\(=\left(271-271\right)+\left(43-17\right)\)
=0+26
=26
( 18+29 ) + ( 158-28-18)
=18+29+158-28-18
=29 + ( 18-18) + ( 158-28)
=29+0+130=159
(13-135+49)-(13+49)
=13-135+49-13-49
=(13-13)+(49-49)-135
=0+0+(-135)
=-135
a)(13+49)-(13-135+49)
=13+49-13+135-49
=13-13+49-49+135
=0+0+135
=135
b)(18+29)+(158-18-29)
=18+29+158-18-29
=18-18+29-29+158
=0+0+158
=158
c)4 .52-3 .(24-9)
=4. 52- (3.24-3.9)
=4. 52-3.24+3.9
=4.25-72+27
=100-72+27
=28+27
=55
d)[93-(20-7)]:16
=(93-20+7):16
=80:16
=5
chúc cậu hok tốt
a) (13 + 49) - (13 - 135 + 49)
= 13 + 49 - 13 + 135 - 49
= (13 - 13) + (49 - 49) + 135
= 0 + 0 + 135
= 135
b) (18 + 29) + (158 - 18 - 29)
= 18 + 29 + 158 - 18 - 29
= (18 - 18) + (29 - 29) + 158
= 0 + 0 + 158
= 158
c) 4.52 -3.(24 - 9)
= 4.25 - 3.15
= 100 - 45
= 55
d) [93 - (20 - 7)] : 16
= [93 - 13] : 16
= 80 : 16
= 5
a) 18 + 29 - 158 - 29 - 18 = -158
b) 13 - 135 + 49 - 13 - 49 = -136
tick nha
a) =18+29+158-29-18=18-18+29-29+158=0+0+158=158
b) =13-135+49-13-49=13-13+49-49-135=0+0-135=-135
Tick nha
a,(18+29)+(158-29-18)= 18+29+158-29-18= 158
b,(13-135+49)-(13+49)= 13-135+49-13-49= -135
a) (18+29)+(158-29-18)
= (18+(-18)) + (29+(-29)) + 158
= 0 + 0 + 158
= 158
b) (13-135+49) - (13+49)
=(13+(-13)) + (49+(-49)) + 135
= 0 + 0 + 135
135
Mình không chắc lắm nhưng mình chỉ làm theo ý mình thôi , nếu đúng bạn cứ sử dụng nếu sai thì thôi coi như bạn góp ý
a) Bỏ ngoặc ta có biểu thức sau :
18 + 29 + 158 - 29 - 18
= ( 18 - 18 ) + ( 29 - 29 ) + 158
= 0 + 0 + 158
= 158
b) Bỏ dấu ngoặc ta có biểu thức sau :
13 - 135 + 49 - 13 + 49
= ( 13 - 13 ) + 135 + ( 49 - 49 )
= 0 + 135 + 0
= 135
a)(18+29)+(158-29-18)=18+29+158-29-18=(18-18)+(29-29)+158=0+0+158=158
b)(13-135+49)-(13+49)=13-135+49-13-49=(13-13)+(49-49)-135=0+0-135=-135
\(a)(18+29)+(158-29-18)\)
\(=18+29+158-29-18\)
\(=18-18+29-29+158\)
\(=0+0+158=158\)
\(b)(13-135+49)-(13+49)\)
\(=13-135+49-13+49\)
\(=13-13+49-49-135\)
\(=0+0-135=-135\)