bai6: tim x: x:9/4+1/3=11/18 lam kieu gi
bang 5/8
bai 4: tinh bang cach thuan tien nhat: a, 5/9*5/2+4/9*5/2 , b, 12*3/4-3/4*12/7 lam kieu gi
giup minh voi
bai2: tinh gia tri bieu thuc: 9/11*(6/7-5/6) lam kieu gi
giup minh voi
minh tich 5 ban thoi nha
bai1 : tinh 7/9-1/12 lam kieu gi
giup minh voi
tim X
a) X-1/8= 2va1/3 nhan 5 va 1/4
b) X:3/2 =1/4
c) 10 va 3/10- x= 4/5
d)x:4/17 = 51
lam nhanh nhanh giup minh
bai4: tim hai phan so toi gian nam giua hai phan so 2/7 va3/7 lam kieu gi
giup minh voi
minh tich 6 ban thoi nha
a 7/15 + 4/5 b 2/3 - 3/8 c 4/7 x 21/16 : 5/8 13 x 42 x 11/ 33x 26 x 35 tinh bang cach nhanh nhat sos x2 giup minh voi
1+2+3+4++5+6+7+8+9+10+11+12+13+14++15+16+17+18+19+20
Hoi tong tren bang bao nhieu (tinh nhanh va giai thich cach lam)
tinh thuan tien: 2/9+4/9+5/9 , 3/8+6/16+3/5 lam nhu the nao giup minh vo minh tich cho