a)(461+(-78)+40)+(-416)
b)((-59)+71)-(-83-(-95))
tính nhanh các tổng
a)[461+(-78)+40]+(-461)
b)[(-59)+71]--83-(-95)]
giúp mình nha mình tick cho
a) [461 + (-78) + 40] + (-461)
= 461 + (-78) + 40 + (-461)
= [461 + (-461)] + (-78) + 40
= -38
b) [(-59) + 71] - (-83) - (-95)
= (-59) + 71 + 83 + 95
= 190
tính nhanh
a)[461+(-78)+40]+(-401)
b)-323+[(-874)+564-241]
c)[53+(-76)]-[-76-(-53)]
d)[(59)+71]-[-83-(-95)]
a,[461+(-78)+40]+(-401)
=461+(-78)+40+(-401)
=[461+(-401)+40]+(-78)
=100 +(-78)
=22
Tính hợp lí
a) -323 + [(-874) +564 - 214]
b) [71 + (-59) ] - [-83 -(-95)]
a, -323 + [(-874) + 564 - 214]
= -323 - 874 + 564 - 214
= - (323 + 874) + (564 - 214)
= - 1197+ 350
= - 847
b, [ 71 + (-59) - (-83 - (95)]
= 71 - 59 + 83 + 95
= 12 + 178
= 190
[(-59)+71]-[-83-(-95)
Tính nhanh
[ 71- (-59)] - [ (-83)- (95)]
[ 71- (-59)] - [ (-83)- (95)]
=130-(-179)
=308
ngta bảo tính nhanh chứ không phải tính chậm mẹ
tính nhanh:
[(-59)+71]-[-83-(-95)]
[(-59) + 71] - [-83 -(-95)]
= 12 - 12
=0
[ (-59+71)-[(-83)-(-95)]
(435-167-89)-(435-89)
: (-624)-[(376+245)-45]
a: \(\left[\left(-59\right)+71\right]-\left[\left(-83\right)-\left(-95\right)\right]\)
\(=\left[71-59\right]-\left[-83+95\right]\)
=12-12
=0
b: \(\left(435-167-89\right)-\left(435-89\right)\)
\(=435-167-89-435+89\)
\(=\left(435-435\right)+\left(89-89\right)-167\)
=0+0-167
=-167
c: \(\left(-624\right)-\left[\left(376+245\right)-45\right]\)
\(=\left(-624\right)-\left[376+245-45\right]\)
\(=\left(-624\right)-376-200\)
=-1000-200
=-1200
TÍNH NHANH
A, [53+(-76)]-[-76-(-53)]
B,[(-59)+71]-[-83-(-95)]
C, 3758+57-3759-66
a ( - 59 + 71 - { - 83 - ( 95 )}
b - 257 - {( - 257 + 156 ) - 56 }
c ( 435 - 167 ) - 89 ( 435 - 89 )
d -329 + ( 15 - 101 ) - ( 25 - 440 )
e ( 116 + 124 ) + ( 215 - 116 - 124 )
f 4524 - ( 864 - 999 ) - ( 36 - 999 )
a: \(-59+71-\left\{-83-\left(95\right)\right\}\)
\(=71-59+81+95\)
\(=12+81+95\)
\(=93+95=188\)
b: \(-257-\left\{\left(-257+156\right)-56\right\}\)
\(=-257-\left(-257+156-56\right)\)
\(=-257-\left(-257+100\right)\)
\(=-257+257-100=-100\)
c: Sửa đề:\(\left(435-167\right)-89-\left(435-89\right)\)
\(=435-167-89-435+89\)
=\(\left(435-435\right)+\left(-89+89\right)-167\)
=0+0-167
=-167
d: \(-329+\left(15-101\right)-\left(25-440\right)\)
\(=-329+15-101-25+440\)
\(=\left(440-329-101\right)+\left(15-25\right)\)
=10-10
=0
e: \(\left(116+124\right)+\left(215-116-124\right)\)
\(=116+124+215-116-124\)
\(=\left(116-116\right)+\left(124-124\right)+215\)
=0+0+215
=215
f: \(4524-\left(864-999\right)-\left(36-999\right)\)
\(=4524-864+999-36+999\)
\(=4524-\left(864+36\right)+999\cdot2\)
\(=4524-900+1998=5622\)