`(1995:0,25+1996:4)xx102xx102xx(3:4-0,75)`
`=(1995xx4+1996xx1/4)xx102xx102xx(0,75-0,75)`
`=(1995xx4+1996xx1/4)xx102xx102xx0`
`=(1995xx4+1999xx1/4)xx102xx0`
`=(1995xx4+1996xx1/4)xx0`
`=0`
=(1995*4+1996:4)*102*(102)(0,75-0,75)
=0
`(1995:0,25+1996:4)xx102xx102xx(3:4-0,75)`
`=(1995xx4+1996xx1/4)xx102xx102xx(0,75-0,75)`
`=(1995xx4+1996xx1/4)xx102xx102xx0`
`=(1995xx4+1999xx1/4)xx102xx0`
`=(1995xx4+1996xx1/4)xx0`
`=0`
=(1995*4+1996:4)*102*(102)(0,75-0,75)
=0
(1995 : 0,25 + 1996 :4) x 101 x 102 x (3 : 4 - 0,75)
1996 x 1997 x (12 - 3 : 0,25) + 1996 : 0,25 + 1995 x 4
Tính nhanh phép tính trên
(1995:0,25+1996:4)x101x102x(3:4-0,75)
tính thuận tiện
( 1995 : 0,25 - 1996 : 4 ) x 101 x 102 x ( 3 : 4 - 0,75 )
37,8x44,6+37,8x54,4+37,8 (375,4x1,25-25,7:2,75)x(24,8:0,25-49,6x2) (1995:0,25+1996:4)x101x102x(3:4-0,75
Tính bằng cách thuận tiện nhất
a ) 1234 x 5678 x ( 630 -315 x 2 : 1996 )
b ) 399 x 45+ 55 x 399
c ) 1996 x 1995 - 996- 1000 -1996 x 1996
d ) (1 + 2+ 3+4+8 +...+512 ) x 101x 102x (3:4 - 0,75 )
1,Tính nhanh a,16×23+35×34+4×108+7×30 b,198×1996+1997×11+1985 ———————————— 1997 × 1996 - 1995 × 1996 c,1/2+2/8+3/28+4/77+5/176
\(\frac{1}{2}\times\frac{1}{3}\times\frac{1}{4}\times...\times\frac{1995}{1996}\times\frac{1996}{1997}\)
3/4 x 0,25 +0,75 x 1,25 - 0,75 x 1/2 SOS
tính
2/3+2/15+2/35+2/63+2/99
1/1×2+1/2×3+1/3×4+..........+1/1995×1996+1/1996×1997