\(2\text{x}+1=15\)
\(\Leftrightarrow2\text{x}=15-1\)
\(\Leftrightarrow2\text{x}=14\)
\(\Leftrightarrow x=7\)
\(2\times x+1=15\\ x+1=15:2\\ x+1=7,5\\ x=7,5-1\\ x=6,5\)
\(2\text{x}+1=15\)
\(\Leftrightarrow2\text{x}=15-1\)
\(\Leftrightarrow2\text{x}=14\)
\(\Leftrightarrow x=7\)
\(2\times x+1=15\\ x+1=15:2\\ x+1=7,5\\ x=7,5-1\\ x=6,5\)
câu 1:
a) 500-(300)-190+(-210)
b) (-3)3 .5+12.(-6)
c) 15.(-19-4)-19.(15-4)
câu 2: tìm x thuộc Z
a) 3x-2=3
b) x chia hết cho 5 và -7<x<11
1.Tìm X:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
Tìm số nguyên x biết :
1) 10+3.(x-1)=10+6x
2) 2.(x-2)+3.(3-x)=-4
3) (|x-2|+1).(x-3)=0
4) (x+5).(-3x-15)=0
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z: (Toán lớp 6)
a) 3.(X-1)-(X-5)= -18
b) 5.(X-2)-(X+3)=15
c) X + (X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925