Đáp án:
Giải thích các bước giải:
câu 1:
a,-2/3-11/3+7/3=-2/3+-11/3+7/3=-2
b,5/6+9/2-5/6+5/2-3/2=(5/6-5/6)+(9/2+5/2-3/2)=0+11/2=11/2
c,(2 1/3-3 1/2).0,2+0,25%=(7/3-7/2).1/5+1/4=-7/6.1/5+1/4=7/30+1/4=1/60
câu 2
a,x-4/3=-5/6
x =-5/6+4/3
x =-5/6+8/6
x =1/2
vẫy=1/2
b,1/3-3/5:x=4/15
3/5:x=1/3-4/15
3/5:x=1/15
x=3/5.15/1
x=9
vậy x=9
c,1/2.(x-1,5)=0,4
1/2.(x-3/2)=2/5
x-3/2 =2/5.2/1
x-3/2 =4/5
x =4/5+3/2
x =23/10
vậy x=23/10
