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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.8,16:(1,32+3,48)-0,345:2=8,16:4,8-0,1725
=1,7-0,1752=1,5248
b.\(71,5\times6,8+2,85:0,1\times6,8=71,5\times6,8+28,5\times6.8\)
\(=6,8\times\left(71,5+28,5\right)=6,8\times100=680\)
c.\(35,26\times6,5-154,55=229,19-154,55=74,64\)
Bài 2:
\(\Leftrightarrow5\left(1-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{11}+...+\dfrac{1}{x}-\dfrac{1}{x+5}\right)=\dfrac{475}{96}\)
\(\Leftrightarrow1-\dfrac{1}{x+5}=\dfrac{95}{96}\)
=>1/x+5=1/96
=>x+5=96
hay x=91
( 10,13 - 2 .x ) .6,5 = 46,8
10,13 - 2.x = 46,8 : 6,5
10,13 - 2.x = 7.2
2.x = 10,13 - 7,2 = 2.93
x = 2.93 : 2
x = 1.465
( 10,13 - 2.x ) . 6,5 = 46,8
( 10,13 - 2.x ) = 46,8 : 6,5
( 10,13 - 2.x ) = 7,2
x = 10,13 - 2
x = 8,13
( 10,13 - 2. 8,13 ) . 6,5 = 46,8 Tk mk nha