325 + 1268+ 332 + 675
=(325 + 675)+(1268 + 332)
=1000+1600
=2600
= 2600 nha
TL :
= 2 600
_HT_
325 + 1268+ 332 + 675
=(325 + 675)+(1268 + 332)
=1000+1600
=2600
= 2600 nha
TL :
= 2 600
_HT_
tinh nhanh: a,8-(2014-2008)+2014
b,1268-(78+1268)-(-78)
c,-48795-(489-48795)+4
d,(-33+180-75)-(180+25)
tinh nhanh :a,8-(2014-2008)+2014
b,1268-(78+1268)-(-78)
c,-48795-(489-48795)+4
d,(-33+180-75)-(180+25)
hay lam giup minh nhe mai minh phai nop roi
1. Tinh nhanh :
a) 54 x 11
b) 54 x 101
c) 675 x 1001
giup mik nhanh nhe
Bài 1: Tính hợp lí
1. 8 - ( 2014 - 2008 ) + 2014
2. 5679 + ( 1357 - 5679 - 17
3. 1268 - ( 78 + 1268 ) - ( -78 )
4. 13567 - ( 15 - 27 )
5. - 48795 - ( 489 - 48795 ) + 400
6. 15641 - ( 27 + 15641 )
tinh nhanh
a)25*100+75*101
b)729+2995
c)325*48
d)1+5+9+13+17+...+81+85
e)B=1*2+2*3+3*4+4*5+...+99*100
Tính nhanh : (–332).( – 25 ) – 25 . 232
tính nhanh
234 x 1257 - 234 x257
1327 x 524 - 524 x327
325 x 1574 - 325 x325 - 325 x24
175 x 1274 - 175 x 273 - 175
ap dung cac tinh chat cua phep cong va phep nhan de tinh
E = 2 * 325 *12 + 4 *69 24 + 3 * 399 * 8
Tính nhanh:
A, 53 x 11+ 79 x 101
B, 45 x 22 + 55 x 23
C, 27 x 332 + 68 x 27 + 73 x 332 + 68 x 73