100 - 7 . ( x - 5 ) = 58

93 . x - 5 = 58

x - 5 =93 : 58 

x - 5 = 1.6

x = 1.6 +5

x = 6.6

100-7.(x-5)=58

     7.(x-5)=100-58

    7.(x-5)=42

        x-5=42:7

        x-5=7

           x=7+5

           x=12

vậy x=12 

100-7x(x-5)=58
 7x(x-5)=100-58=42
x-5= 42:7=6
x=6+5
x=11

x : 100 = 9,5 x 3, 58 

x : 100 = 34,01

x : 100 = 34,01 x 100

x  =  3401

x : 100 = 9,5 x 3, 58 

x : 100 = 34,01

x : 100 = 34,01 x 100

x  =  3401

x : 100 = 9,5 x 3, 58

x : 100 = 34,01

x : 100 = 34,01 x 100

   x  =  3401

a) x : 100 = 9,5 x 3, 58 

x : 100 = 34,01

x : 100 = 34,01 x 100

x  =  3401

b)  98 – x = 255,92 : 5,6 ?

98 – x = 45,7

x =  98 –  45,7 

x =   52,3

a. 348 : x = 12 

x = 348 : 12

x = 29

b. 9x - 7 = 119 

9x = 119 + 7 

9x = 126 

x = 126 : 9 

x = 14 

c. 100 - 7 . ( x - 5 ) = 58 

7 . ( x - 5 ) = 100 - 58 

7 . ( x - 5 ) = 42 

x - 5 = 42 : 7

x - 5 = 6

x = 6 + 5

x = 11

d. x không thuộc số tự nhiên

a)348:x=12

x=348:12

x=29

b)9x-7=119

9x=119+7

9x=126

x=126:9

x=14

c)100-7.(x-5)=58

7.(x-5)=100-58

7.(x-5)=42

x-5=42:7

x-5=6

x=6+5

x=11

d)2^x-2.2³=64

2^x-2.8=64

2^x-16=64

2^x=64+16

2^x=80

đề sai

a) \(58+7x=100\)

\(=>7x=100-58\)

\(=>7x=42\)

\(=>x=42:7\)

\(=>x=6\)

b) \(3x-7=28\)

\(=>3x=28+7\)

\(=>3x=35\)

\(=>x=35:3\)

\(=>x=\dfrac{35}{3}\)

c) \(x-56:4=16\)

\(=>x-14=16\)

\(=>x=16+14\)

\(=>x=30\)

d) \(101+\left(36-4x\right)=105\)

\(=>36-4x=105-101\)

\(=>36-4x=4\)

\(=>4x=36-4\)

\(=>4x=32\)

\(=>x=32:4\)

\(=>x=8\)

e) \(\left(x-12\right):12=12\)

\(=>x-12=12.12\)

\(=>x-12=144\)

\(=>x=144-12\)

\(=>x=132\)

f) \(\left(3x-2^4\right).7^3=2.7^4\)

\(=>3x-2^4=2.7^4:7^3\)

\(=>3x-16=2.7=14\)

\(=>3x=14+16\)

\(=>3x=30\)

\(=>x=30:3\)

\(=>x=10\)

i) \(\left(10+2x\right).4^{2011}=4^{2013}\)

\(=>10+2x=4^{2013}:4^{2011}\)

\(=>10+2x=4^2=16\)

\(=>2x=16-10\)

\(=>2x=6\)

\(=>x=6:2\)

\(=>x=3\)

\(#WendyDang\)