1.Dien so thich hop vao cho cham
a, 4m2 5 dm2 = ................ dm2 80 000 cm2 = ...................... m2
7m2 14 cm2 = ...................... cm2 4 000 000 m2 = ..................... km2
9 km2 15 m2 = ................... m2 15 000 009 m2 = .................. km2 ............ m2
b, 3/4 gio = ................. phut ; 3/5 the ki = ............. nam ; 5/6 ngay = ................... gio
c, tinh 5/12 + ( 3/4 + 2/3 ) : 34/3 = ..........................................................................................................
2.Tim X
a,7 x X + 5 x X = 175 + 125 b, 14 x X - 6 x X = 64 x16
4. Tim so co 4 chu so , biet rang khi viet them chu so 2 vao ben trai so do thi duoc so moi gap 17 lan so can tim ?
5. a, Sap xep cac phan so sau theo thu tu tu lon den be :
3/8 ; 5/6 ; 4/3 ; 13/12; 5/4
b, khoanh vao phan so lon hon 4/5 :
5/4 48/60 20/24 36/ 45 18/15
5. trong vuon co 81 cay cam , quyt va dao . So cay cam = 2/3 so cay quyt , so cay quyt = 3/4 so cay dao . Hoi trong vuon do co ? cay moi loai ?
Cac bn luu y bai 2 tim x dau x nay la dau nhan X dau X nay la ich xo