Tinh nhanh 7429-(3125+429)+6135
13/9-(6/7-5/9)+20/7
tinh nhanh
1. (423143*846867-423133):(423134*846867-423133)
2.4*133*25-5*122*20
nhanh giup minh nha.
Tinh nhanh:1/5+1/10+1/20+1/40+1/80+1/160+1/320+1/640
tinh nhanh
1. (423143*846867-423133):(423134*846867-423133)
2.4*133*25-5*122*20
nhanh giup minh nha.
minh cho 3 tich.
B=3/5+3/10+3/20+.........+3/100 TINH NHANH
tinh nhanh tong sau
1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
39x(64-21)+21x(39+64) tinh nhanh
Tinh nhanh:1/5+1/10+1/20+1/40+1/80+1/160+1/320+1/640
Giup minh voi,minh can lam
Tinh nhanh
a)10/11*4 2/5(hon so)
b)2015-4/5*25%
Tim X
8,75*X=20-1,25*X