Tinh cach hop li
A=5/12 . 3/4 - 6/8 : 7/15 + 3/4 : 7/12 - 6/8 . 8/15
B=(-2,5) . (-4) . (-7,9)
Tinh bang cach hop li A= [1-(1/49)-1/49-1/(7*7)*(7*7)/4-4/7-2/7*2/7-2/243
1)So sanh cac so huu ti (mot cach hop li)
a)4/-9 va 8/-13
b)2005/-2006 va -2007/2004
c)33/-134 va -51/203
tap hop nao sau day la tap hop cac phan so bang phan so -4/12
Tinh hop li:
a.8/9-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
b.(-1/2)-(-3/5)+(-1/9)+1/127-(+7/18)+4/35-(-2/7)
c.3/5+3/11-(-3/7)+(2/97)-1/35-3/4+(-2/7)
Cac ban oi giup minh voi
tim x biet 6.4/x=x/99tim cac so nguyen biet (|x|-3)(x^2+4) be hon hoac bang 4hai dia diem a va b cach nhau 90kmhai nguoi di xe dap cung mot luc tu ava bde gap nhau va ho gap nhau cach a 50km;nhung neu nguoi di tu b di nhanh hon xuat phat truoc nguoi a 1 gio thi ho gap nhau cach a 350/9km tinh van toc moi nguoiCac giai ho minh voi minh se tick cho
Cac ban nho viet ho cach lam min voi
Bai 18 : Tinh bang cach thuan tien nhat :
a) 3,78 x ( 200 - 68 ) - 3,78 x ( 100 - 68 )
b) 1,5 + 1,8 + 2,1 + ................... 4,5 + 4,8
so sanh cac so huu ti sau bang cach nhanh nhat
a,-1/5va1/1000 b,267/-268va-1347/1343 c,-13/38va29/-88 d,-18/31va-181818/313131
thuc hien phep tinh sau mot cach hop li
\(\frac{-1}{90}\)\(-\)\(\frac{1}{72}\)\(-\)\(\frac{1}{56}\)\(-\)\(\frac{1}{42}\)\(-\)\(\frac{1}{30}\)\(-\)\(\frac{1}{20}\)\(-\)\(\frac{1}{12}\)\(-\)\(\frac{1}{6}\)\(-\)\(\frac{1}{2}\)
