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a) \(\left(2+x\right):5=6\)
\(2+x=6\times5\)
\(2+x=30\)
\(x=30-2\)
\(x=28\)
b) \(\left(3\times x+15\right)-75=0\)
\(3\times x+15=0+75\)
\(3\times x+15=75\)
\(3\times x=75-15\)
\(3\times x=60\)
\(x=60:3\)
\(x=20\)
( x+40 ) * 15 = 75 * 2
( x+40 ) * 15 = 150
( x+40 ) = 150 : 15
x + 40 = 10
x = 10 - 40
x = ( -30 )
HOk tốt
a, 15*x + 15*1,4 = 75
15*( x + 1,4) = 75
x + 1,4 = 75 : 15
x + 1,4 = 5
x = 5 - 1,4
x = 3,6
b, 2*x + 1 + 5*x + 19 + x = 100
x*( 2 + 5 + 1 ) + 1 + 19 = 100
x * 8 + 20 = 100
x*8 = 100 - 20
x*8 = 80
x = 80 : 8
x = 10
a, 15x+15.1,4=75
=> 15x=75-15.1,4=75-21=54
=> x=54/15
Vì x là số tự nhiên
=> ko có gt của x
b, 2x+1+5x+19+x=100
=>(2x+5x+x)+(1+19)=100
=>8x+20=100
=>8x=100-20=80
=>x=80:8=10
KL
( 3/4 . x - 0,54 ) . 4/9 + 8/75 = 4/15
( 3/4 . x - 0,54 ) . 4/9 = 4/15 - 8/75
( 3/4 . x - 0,54 ) . 4/9 = 4/25
3/4 . x - 0,54 = 4/25 : 4/9
3/4 . x - 0,54 = 9/25
3/4 . x = 9/25 + 0,54
3/4 . x = 9/10
x = 3/4 : 9/10
x = 5/6
\(\left(\frac{3}{4}x-0,54\right)\frac{4}{9}+\frac{8}{75}=\frac{4}{15}\)
\(\left(\frac{3}{4}x-\frac{27}{50}\right)\frac{4}{9}=\frac{4}{15}-\frac{8}{15}=\frac{-4}{15}\)
\(\frac{3}{4}x-\frac{27}{50}=\frac{-4}{15}:\frac{4}{9}=\frac{-3}{5}\)
\(\frac{3}{4}x=\frac{-3}{5}+\frac{27}{50}=\frac{-3}{50}\)
\(x=\frac{-3}{50}:\frac{3}{4}\)
\(x=\frac{-2}{25}\)
a) 32 : (3.x - 2) = 8
3x - 2 = 32 : 8
3x - 2 = 4
3x = 4 + 2
3x = 6
x = 6 : 3
x = 2
b) 75 : (x - 18) = 25
x - 18 = 75 : 25
x - 18 = 3
x = 3 + 18
x = 21
c) (15 - 6.x) . 243 = 729
15 - 6x = 729 : 243
15 - 6x = 3
6x = 15 - 3
6x = 12
x = 12 : 6
x = 2
d) 4.(x - 12) + 9 = 17
4(x - 12) = 17 - 9
4(x - 12) = 8
x - 12 = 8 : 4
x - 12 = 2
x = 2 + 12
x = 14
e) 20 - 2.(x + 4) = 4
2(x + 4) = 20 - 4
2(x + 4) = 16
x + 4 = 16 : 2
x + 4 = 8
x = 8 : 2
x = 4
`32: ( 3xx x -2)=8`
`3xx x-2=32:8`
`3xx x-2=4`
`3 xx x=4+2`
`3xx x=6`
`x=6:3`
`x=2`
__
`75 : (x-18) =25`
`x-18=75:25`
`x-18= 3`
`x=3+18`
`x=21`
__
`(15-6 xx x ) xx 243 =729`
`15-6 xx x = 729 : 243`
`15-6 xx x = 3`
`6 xx x=15-3`
`6 xx x=12`
`x=12:6`
`x=2`
__
`4 xx (x-12)+9=17`
`4 xx (x-12)=17-9`
`4 xx (x-12)= 8`
`x-12=8:4`
`x-12=2`
`x=2+12`
`x=14`
__
`20-2xx(x+4)=4`
`2xx(x+4)=20-4`
`2xx(x+4)=16`
`x+4=16:2`
`x+4=8`
`x=8-4`
`x=4`
(-33)+45+(-67)
=[(-33)+(-67)]+45
=(-100)+45
=55
mấy câu sau mỏi tay nên ghi đáp án thoi
c=3
2a x=10
a) \(1,5\times x+15+x=31\)
\(\Rightarrow1,5\times x+x+15=31\)
\(\Rightarrow\left(1,5+1\right)\times x=31-15\)
\(\Rightarrow2,5\times x=16\)
\(\Rightarrow x=16:2,5\)
\(\Rightarrow x=6,4\)
Vậy x = 6,4
b) \(50\%\times x+x=52\)
\(\Rightarrow\frac{1}{2}\times x+x=52\)
\(\Rightarrow\left(\frac{1}{2}+1\right)\times x=52\)
\(\Rightarrow\frac{3}{2}\times x=52\)
\(\Rightarrow x=52:\frac{3}{2}\)
\(\Rightarrow x=\frac{104}{3}\)
Vậy \(x=\frac{104}{3}\)
c) \(\frac{75}{20}-x=\frac{2}{3}\text{}\text{}\times10\)
\(\Rightarrow\frac{15}{4}-x=\frac{20}{3}\)
\(\Rightarrow x=\frac{15}{4}-\frac{20}{3}\)
\(\Rightarrow x=\frac{-35}{12}\)
Vậy \(x=\frac{-35}{12}\)
_Chúc bạn học tốt_
a)\(\frac{11}{14}-\frac{x}{7}=\frac{23}{14}\)
\(\Leftrightarrow11-2x=23\)
\(\Leftrightarrow2x=-12\)
\(\Leftrightarrow x=-6\)
b)7,75-(0,5x-0,2)=5
<=>7,95-0,5x=5
<=>0,5x=2,95
<=>x=5,9
c)17,5-x=45/15
<=>x=14
câu a) bạn chưa học âm thì mình bó tay chứ cái câu a) x ra âm là chắc
nhớ tíck mình đấy
a) 11/14-x/7=23/14
x/7= 23/14-11/14
x/7=6/7
Vậy x=7
b) 7.75-(0.5x X -0.2)=5
0.5xX-0.2= 7.75-5
0.5xX-0.2=2.75
0.5xX =2.75+0.2
0.5xX =2.95
X = 2.95:0.5
X = 5.9
c) 17.5-x=45/15
17.5-x=3
x=17.5-3
x=14.5
`2xx` `x+15=75`
`2xx` `x=75-25`
`2xx` `x=60`
`x=60:2`
`=>x=30`
Vậy `x=30`
#Nem
4x - 15 = -75 +x
4x - x = -75+15
3x =- 60
x = -60 : 3
x= -20
Vậy x = -20
đúng kh bạn