x*1.8=72

x=72;1.8

x=40

câu 2 là0.8925

a) x*1,8=72

x=72:1,8=40

b) x*0,34=1,19*1,02

x*0,34=1,2138

x=1,2138:0,34=3,57

c)x*1,36=4,76*4,08

x*1,36=19,4208

x=19,4208:1,36=14,28

\(x\times1,8=72\)

            \(x=72:1,8\)

            \(x=40\)

\(x\times0,34=1,19\times1,02\)

\(x\times0,34=1,2138\)

               \(x=1,2138:0,34\)

               \(x=3,57\)

\(x\times1,36=4,76\times4,08\)

\(x\times1,36=19,4208\)

               \(x=19,4208:1,36\)

               \(x=14,28\)

X  x 1,8 = 72

X = 72 : 1,8

X = 40

X x 0,34 = 1,19 x 1,02

X  x 0,34 = 1,1238

 X = 1,1238 : 0,34 

X = 3,57

X  x 1,36 = 4,76 x 4,08

 X x 1,36 = 19,4208

X = 19,4208 : 1,36

 X = 14,28

a)X x 1,8 = 72 

X=72:1,8

X=40

b)X x 0,34 = 1,19 x 1,02

X=(1,19 x 1,02):0,34

X=1,2138:0,34

X=3,57

c)X x 1,36 = 4,76 x 4,08

X=(4,76 x 4,08):1,36

X=19,4208 : 1,36

X=14,28

HT

\(x*0,34=1,2138=>x=1,2138:0,34=3,57\) nhé

x x 0,34 = 1,19 x 1,02

x x 0,34 = 1,2138

x = 1,2138 : 0,34

x = 3,57

X x 0,34 = 1,19 x 1,02

X x 0,34 = 1,2138

X = 1,2138 : 0,34

X = 3,57

X x 0,34 = 1,19x 1,02

=> X x 0,34 = 1,2138

=> X = 1,2138 : 0,34 

=> X = 3,57 

X x 0,34 = 1,19 x 1,02

X x 0,34 = 1,238

          x = 1,238 : 0,34

          x = 3,75

Đáp án : 3,75

\(x\times0,34=1,19\times1,02\)

\(\Rightarrow x\times0,34=1,2138\)

\(\Rightarrow x=1,2138:0,34\)

\(\Rightarrow x=3,57\)

X x 0,34 = 1,19 x 1,02

X x 0,34 = 1,2138

X           = 1,2138 : 0,34

X           =        3,57

  Xx0.34=1,2138                    X=1,2138:0,34=3,57

\(x.0,34=1,19.1,02\)

\(0,34x=1,2138\)

\(x=1,2138:0,34\)

\(x=3,57\)

Vậy x = 3,57