b1 tính nhanh
A.-4/9.7/15+4/-9.8/15
b.4/11/23(hỗn số)-9/14+2/12/23-5/4
c.11/1/4-(2/5/7+5/1/4 )
B2 thực hiện phép tính
a.3/4.16/9-7/5.-21/20
b.(20+9/1/40):2/1/4
c.2/1/3-1/3.[-3/2+(2/3+0,4:5)]
B3.tìm x
a.x:4/3=1/1/2
b.2/3-1/2.x=5/12
c.2/1/4.(x-7/1/3)=1.5
VD:A/A/A đólà hỗn số nha
Giúp mik vs
A.-4/9.7/15+4/-9.8/15 b.4/11/23(hỗn số)-9/14+2/12/23-5/4 c.11/1/4-(2/5/7+5/1/4 )
b.4/11/23(hỗn số)-9/14+2/12/23-5/4
a.x:4/3=1/1/2
c.11/1/4-(2/5/7+5/1/4 )b.2/3-1/2.x=5/12
c.2/1/4.(x-7/1/3)=1.5