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\(2\left(x-5\right)+10=20\)
\(\Leftrightarrow2\left(x-5\right)=10\)
\(\Leftrightarrow x-5=5\)
\(\Leftrightarrow x=10\)
\(\left(3x+1\right)-17=5\)
\(\Leftrightarrow3x+1=22\)
\(\Leftrightarrow3x=21\)
\(\Leftrightarrow x=7\)
\(\left(10x+120\right)-138=262\)
\(\Leftrightarrow10x+120=400\)
\(\Leftrightarrow10x=280\)
\(\Leftrightarrow x=28\)
\(4\left(x+1\right)-12=8\)
\(\Leftrightarrow4\left(x+1\right)=20\)
\(\Leftrightarrow x+1=5\)
\(\Leftrightarrow x=4\)
\(2x+2\frac{1}{3}=\frac{1}{2}:\frac{3}{2}\)
\(\Leftrightarrow2x+\frac{7}{3}=\frac{1}{3}\)
\(\Leftrightarrow2x=-2\)
\(\Leftrightarrow x=-1\)
\(2\left(x-5\right)+10=20\)
\(2x-10+10=20\)
\(2x=20\)
\(x=10\)
\(\left(3x+1\right)-17=5\)
\(3x+1-17=5\)
\(3x-16=5\)
\(3x=21\)
\(x=\frac{21}{3}=7\)
\(\left(10x+120\right)-138=262\)
\(10x+120-138=262\)
\(10x-18=262\)
\(10x=280\)
\(x=28\)
\(4\left(x+1\right)-12=8\)
\(4x+4-12=8\)
\(4x-8=8\)
\(4x=16\)
\(x=4\)
2.(x-5)+10 = 20
2.(x-5) = 20 - 10
2.(x-5) = 10
x-5 = 10 : 2
x-5 = 5
x = 5 + 5
x = 10
(3x+1)-17 = 5
3x+1 = 5 + 17
3x+1 = 22
3x = 22 - 1
3x = 21
x = 21 : 3
x = 7
(10x+120)-138 = 262
10x+120 = 262 + 138
10x+120 = 400
10x = 400-120
10x = 280
x = 280 : 10
x = 28
4.(x+1)-12 = 8
4.(x+1) = 8 + 12
4.(x+1) = 20
x+1 = 20 : 4
x+1 = 5
x = 5 - 1
x = 4
\(2x+2\frac{1}{3}=\frac{1}{2}:\frac{3}{2}\)
\(2x+\frac{7}{3}=\frac{1}{3}\)
\(2x=\frac{1}{3}-\frac{7}{3}\)
\(2x=-2\)
x = (-2) : 2
x = -1
B) 3/7 . x + x = 42
x(3/7+1) = 42
10/7 . x = 42
x= 42.7/10
x= 147/5
1)4
2) 1 phần 5
3) 110 phần 13
4)7 phần 4
5)0
nếu đúng thì tk nhé hóng ^^
\(a,-12\left(x-5\right)+7\left(3-x\right)=5\)
\(-12x+60+21-7x=5\)
\(-12x-7x+81=5\)
\(-19x=5-81\)
\(-19x=-76\)
\(x=-76:\left(-19\right)\)
\(x=4\)
\(Vậyx=4\)
\(b,30\left(x+2\right)-6\left(x-5\right)-24x=100\)
\(30x+60-6x-30-24x=100\)
\(30x-6x-24x+60-30=100\)
\(0x+30=100\)
\(\Rightarrow Vôlý\)
Vậy không có giá trị nào của x thỏa mãn đề bài.
\(c,-5\left(x+\frac{1}{5}\right)-\frac{1}{2}\left(x-\frac{2}{3}\right)=\frac{3}{2}x-\frac{5}{6}\)
\(-5x-1-\frac{1}{2}x-\frac{1}{3}=\frac{3}{2}x-\frac{5}{6}\)
\(-5x-\frac{1}{2}x-1-\frac{1}{3}=\frac{3}{2}x-\frac{5}{6}\)
\(-\frac{11}{2}x-\frac{2}{3}=\frac{3}{2}x-\frac{5}{6}\)
\(-\frac{2}{3}+\frac{5}{6}=\frac{3}{2}x+\frac{11}{2}x\)
\(-\frac{4}{6}+\frac{5}{6}=\frac{14}{2}x\)
\(\frac{1}{6}=7x\)
\(x=\frac{1}{6}:7\)
\(x=\frac{1}{6}.\frac{1}{7}\)
\(x=\frac{1}{42}\)
\(Vậyx=\frac{1}{42}\)
\(d,-3\left(x-\frac{1}{2}\right)-5\left(x+\frac{3}{5}\right)=-x+\frac{1}{5}\)
\(-3x+\frac{3}{2}-5x-3=-x+\frac{1}{5}\)
\(-3x-5x+\frac{3}{2}-3=-x+\frac{1}{5}\)
\(-8x+\frac{3}{2}-\frac{6}{2}=-x+\frac{1}{5}\)
\(-8x-\frac{3}{2}=-x+\frac{1}{5}\)
\(-\frac{3}{2}-\frac{1}{5}=-x+8x\)
\(\frac{15}{10}-\frac{2}{10}=7x\)
\(7x=\frac{13}{10}\)
\(x=\frac{13}{10}:7\)
\(x=\frac{13}{10}.\frac{1}{7}\)
\(x=\frac{13}{70}\)
\(Vậyx=\frac{13}{70}\)
a) \(\left(9^4.8+9^4.5\right):\left(9^2.\left(10-1\right)\right)\)
=\(9^4.13:9^3=13.9=117\)
b) 100-(75-25)=100-50=50
5.(2x+1)=20
2x+1=20/5
2x+1=4
2x=4-1
2x=3
x=3/2
219-7.(x+1)=100
7.(x+1)=219-100
7.(x+1)=119
(x+1)=119:7
x+1=17
x=17-1
x=16
k cho mk nhé chúc bn học tốt