a) \(\left(2,4-3x\right).0,5=0,9\)

\(2,4-3x=0,9:0,5\)

\(2,4-3x=1,8\)

\(3x=2,4-1,8\)

\(3x=0,6\)

\(x=0,6:3\)

\(x=0,2\)

b) \(\left(8,8x-50\right):0,4=51\)

\(8,8x-50=51.0,4\)

\(8,8x-50=20,4\)

\(8,8x=20,4+50\)

\(8,8x=70,4\)

\(x=70,4:8,8\)

\(x=8\)

c) \(\left(0,472-x\right):2=1,634\)

\(0,472-x=1,634.2\)

\(0,472-x=3,268\)

\(x=0,472-3,268\)

\(x=-2,796\)

d) \(1,6-\left(x-0,2\right)=6,5\)

\(x-0,2=1,6-6,5\)

\(x-0,2=-4,9\)

\(x=-4,9+0,2\)

\(x=-4.7\)

\(a.2,4-3x=1,8\)

\(3x=0,6\)

\(x=0,2\)

\(b.8,8x-50=20,4\)

\(8,8x=70,4\)

\(x=8\)

\(c.0,472-x=3,268\)

\(x=-2,796\)

\(d.x-0,2=-4,9\)

\(x=-4,7\)

a) \(\left(2,4-3x\right).0,5=0,9\)

\(\Rightarrow\left(2,4.3x\right)=0,9:0,5\)

\(\Rightarrow2,4.3x=0,45\)

\(\Rightarrow3x=0,45:2,4\)

\(\Rightarrow3x=\dfrac{3}{16}\)

\(\Rightarrow x=\dfrac{1}{16}\)

b)\(\left(8,8x-50\right):0,4=51\)

\(\Rightarrow\left(8,8x-50\right)=51.0,4\)

\(\Rightarrow8,8x-50=\dfrac{255}{3}\)

\(\Rightarrow8,8x=135\)

\(\Rightarrow x=135:8,8\)

\(\Rightarrow x=\dfrac{675}{44}\)

\(a.0,4:x=1,6-0,5:x.\\ 0,4:x+0,5:x=1,6.\\ \left(0,4+0,5\right):x=1,6.\\ 0,9:x=1,6.\\ x=\dfrac{9}{16}.\)

\(b.72,6-x\times25=68,6.\\ x\times25=4.\\ x=\dfrac{4}{25}.\)

0,4x91+1,6x2+0,4=40

36,4+3,2+0,4

39,6+0,4

40

đúng thì

0,4:x = 1,6 - 0,5 : x => 1,6 = 0,5 : x + 0,4 : x => 1,6 = (0,5+0,4) : x = 0,9 :x => x = 0,9 : 1,6 = 0,5625

x=0.5625

MÌNH LÀM KO BIẾT ĐÚNG KO

0,5 : X  + 0,4 : X = 1,6

( 0,5 +0,4 ) : X = 1,6

0,9: X = 1,6 

X = 1,6 : 0,9

X = 0,5625 

nếu đúng thì k nhé

Đáp số = 0,5625

\(1,6-\frac{0,5}{x}=\frac{0,4}{x}\Rightarrow1,6=\frac{0,9}{x}\Rightarrow x=\frac{0,9}{1,6}=\frac{9}{16}\)

Vậy x = 9/16