Tính nhanh
a . 321 + ( − 15 ) + [ 30 + ( − 321 ) ] b . ( 2018 + 432 ) + [ 168 + ( − 2018 ) ]
Tính nhanh
321 + { -15 + [ 30 + ( - 321)] }
( 2016 + 432 ) + ( 168 + ( - 2016)
321 + { -15 + [ 30 + (-321) ] }
= 321 + { -15 + [ 30 - 321 ] }
= 321 + { -15 + 30 - 321 }
= 321 - 15 + 30 - 321
= (321 - 321) - (15 - 30)
= 0 - (-15)
= 15
(2016 + 432) + [168 + (-2016) ]
= 2016 + 432 + [ 168 - 2016 ]
= 2016 + 432 + 168 - 2016
= (2016 - 2016) + (432 + 168)
= 0 + 600
= 600
minh khong biet dau minh chi moi lop 5 thoi
chuc ban nam moi vui ve
thank you very much
Tinh nhanh :
a, 321 + { 15 + [ 30 + (-321) ] }
b, ( 2016 + 432 ) + [ 168 + (-2016) ]
a)=321+15+30+(-321)
=[321+(-321)]+(15+30)
=0+45=45
b)=2016+432+168+(-2016)
=[2016+(-2016)]+(432+168)
=0+600=600
a)321+{15+[30+(-321)]}=[321+(-321)]+(15+30)=0+45=45
b)(2016+432)+[168+(-2016)]=[2016+(-2016)]+(432+168)=0+600=600
bài 1: tính
a, (1267-196)-(267+304)
b, 321+{-15+[30+(-321)]}
c, 19.25.25.81+100
a, (1267-196)-(267+304)
= 1267-196-267-304
= (1267-267)-(196+304)
= 1000-500
= 500
b, 321+{-15+[30+(-321)]}
=321+{-15+30-321}
=321-15+30-321
=(321-321)+(-15+30)
=0+15
=15
c, \(19\cdot25\cdot25\cdot81+100\)
\(=961875+100\)
\(=961975\)
321+{-15 + [30+(-321)]}
321+{(-15)+[30+(-321)]}=321+[(-15)+(291)]=321+(-306)=15
a, ( -2009 ) - ( 234 - 2009 )
b, ( 134 - 167 + 45 ) - ( 134 + 45 )
c, 321 + { -15 + [ 30 + ( -321 ) ]}
\(a.\left(-2009\right)-\left(234-2009\right)\\ =-2009-234+2009\\ =\left(-2009+2009\right)-234\\ =0-234\\ =-234\)
\(b.\left(134-167+45\right)-\left(134+45\right)\\ =134-167+45-134-45\\ =\left(134-134\right)+\left(45-45\right)-167\\ =0+0-167\\ =0-167\\ =-167\)
14-(-15)-21
321+{-15+[30+(-321)]}
(2016+432)+[168+(-2016)]
\(\text{14-(-15)-21}\)
\(=14+15-21\)
\(=29-21\)
\(=8\)
\(321+\left\{-15+\left[30+\left(-321\right)\right]\right\}\)
\(=321+\left(-15\right)+30+\left(-321\right)\)
\(=\left(321+\left(-321\right)\right)+\left(\left(-15\right)+30\right)\)
\(=0+15\)
\(=15\)
\(\text{(2016+432)+[168+(-2016)]}\)
\(=2016+432+168+\left(-2016\right)\)
\(=\left[2016+\left(-2016\right)\right]+\left(432+168\right)\)
\(=0+600\)
\(=600\)
học tốt
bài 1
a) 321 + { ( -15) + [ 30 + ( -321 )]
b) (2016 + 432) + [ 168 + ( -2016)
ghi cách giải giúp mình nha
giải luôn giúp mình được không?
a)
= 321 + { ( -15) + (-291)}
= 321 + (-306)
= 15
b)
= (2016 + 432) + (-1848)
= 2448 + (-1848)
= 600
tính nhanh
a) 214 +[ 120- ( 214 +120)]
b) ( -321 ) -[ ( -321 +35 ) -235 ]
a) 214 + [ 120 - ( 214 + 120 ) ]
= 214 + [ 120 + ( -120 ) + ( -214 ) ]
= 214 + [ 0 + (-214 ) ]
= 214 + ( -214 )
= 0
b) ( - 321 ) - [ ( -321 + 35 ) - 235 ]
= -321 ) - [ ( -321 ) + ( -35 ) + 235 ]
= -321 - [ -321 + 200 ]
= -321 + 321 + 200
= 0 + 200
= 200
a)214+[120-(214+120)]
=214+120-214-120
=[(-214)+214]+[120+(-120)]
=0+0=0
2. Tính nhanh
a) 214 + [120 - (214 + 120].
b) (- 321) - [(-321 + 35) - 235]
a)214+[120-(214+120)]=214+120-214-120=(214-214)+(120-120)=0+0=0
b)(-321)-[(-321+35)-235]=(-321)+321-35+235=(-321+321)-(35-235)=0-(-200)=200