B1 : Tính nhanh
( 2016 + 432 ) + [ 168 + ( - 2016 ) ]
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
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 . 321 + ( − 15 ) + [ 30 + ( − 321 ) ] b . ( 2018 + 432 ) + [ 168 + ( − 2018 ) ]
Tính nhanh: 2016 × 35 + 2016 × 65=
2016 × 99 + 2016=
2016 × 102 - 2016 × 2=
2016 × 101 - 2016=
2016 × 35 + 2016 × 65
= 2016 × (35+65)
= 2016 × 100
= 201600
2016 × 99 + 2016
= 2016 × 99 + 2016 × 1
= 2016 × (1+99)
= 2016 × 100
= 201600
2016 × 102 - 2016 × 2
= 2016 × (102-2)
= 2016 × 100
= 201600
2016 × 101 - 2016
= 2016 × 101 - 2016 × 1
= 2016 × (101-1)
= 2016 × 100
= 201600
2016 x 35 + 2016 x 65
= 2016 x ( 35 + 65 )
= 2016 x 100
= 201600
2016 x 99 + 2016
= 2016 x 99 + 2016 x 1
= 2016 x ( 99 + 1 )
= 2016 x 100
= 201600
2016 x 102 - 2016 x 2
= 2016 x ( 102 - 2 )
= 2016 x 100
= 201600
2016 x 101 - 2016
= 2016 x 101 - 2016 x 1
= 2016 x ( 101 - 1 )
= 2016 x 100
= 201600
2016x35+2016+65=2016x(35+65)
=2016x100
=201600
2016x99+2016=2016x(99+1)
=2016x100
=201600
2016x102-2016x2=2016x(102-2)
=2016x100
=201600
2016x101-2016=2016x(101-1)
=2016x100
=201600
!
Tính nhanh
2016 x 14 + 2016 x 85 + 2016
2016 x 14 + 2016 x 85 + 2016
= 2016 x 14 + 2016 x 85 + 2016 x 1
= 2016 x (14 + 85 + 1)
= 2016 x 100 = 201600
Tính nhanh :
(1-1000/2016)×(1-1001/2016)×(1-1002/2016)×...×(1-2017/2016) = ???
Thằng Vũ Ánh Lâm óc vật ngu như bò mà đòi trả lời
B1 .Thực hiện phép tính
a . âm 5/2016 × 2/11 + âm 5/2016 × 9/11 + 2021/2016
b. âm 1/4 × 152/11 - 0,25 × 68/11
c. Tìm các số nguyên a biết :
33% + 48% < hoặc = c/100 < 85%