Tinh bang cach thuận tiện18,689:85+18,689+18,689:14
Tinh bang cach thuận tien : C: 19994*867+1994*133
1994*867+1994*133
=1994*(867+133)
=1994*1000
=1994000
Tinh bang cach thuận tien: D: 1994*867+1995*133
: D: 1994*867+1995*133=39890000
Tinh bang cach thuận tien : A) 328450-296+72296-450+600000
328450-296+72296-450+600000
=(328450-450)+(72296-296)+600000
=328000+72000+600000
=400000+600000
=1000000
= (328450 - 450) + (72296 - 296 + 600000)
= 328000 + 72000 + 600000
= 400000 + 600000
= 1000000
Tinh bang cach thuận tien 4+8+12+16+20+24+28????
4+8+12+16+20+24+28
= (16+24)+(28+12)+20+4+8
= 40+40+20+12
= 112
tinh bang cach thuận tien nhất: 13/19 . (19/13 - 7/9)
Tinh bang 2 cach
A 5152 ; [ 46 nhan 8 ]
B [ 125 cong 85 ] ; 5
A
5152 : ( 46 x 8 )
= 5152 : 368
= 14
5152 : ( 46 x 8 )
= 5152 : 46 : 8
= 112 : 8
= 14
B
( 125 + 85 ) : 5
= 210 :5
= 42
( 125 + 85 ) : 5
= 125 : 5 + 85 : 5
= 25 + 17
= 42
Tinh bang cach hop li
7/13×5/14×39/15
=( 7*5*39)/(13*14*15)
=(7*5*3*13)/(13*7*2*5*3)
=1/2
\(\frac{7}{13}x\frac{5}{14}x\frac{39}{15}\)
\(=\frac{7x5x39}{13x14x15}\)
\(=\frac{7x5x13x3}{13x7x2x5x3}\)
\(=\frac{1}{2}\)
tinh bang cach thuan tien nhat
16*48+8*48+32*14
16x48+8x48+32x14
=48x(16+8)+32x14
=48x24+32x14
=1152+448
=1600
16 x 48 + 8 x 48 + 32 x 14
= 48 x (16 + 14) x (32 + 8)
=48 x 20 x 40
=38400
tinh bang cach thuan tien nhat
0,2 * 317 * 7 + 0,14* 3520 + 33,1 * 14 = ?
0.2 x 317 x 7 + 0.14 x 3520 + 33.1 x 14
= 1.4 x 317 + 1.4 x 352 + 331 x 1.4
= 1.4 x ( 317 + 352 + 331 )
= 1.4 x 1000
= 1400