0.25 x 3/7 x30 x 0.5 x 8/45
0.25*2/1/3*30*0.5*8/45
\(0,25.2\frac{1}{3}.30.0,5.\frac{8}{45}\)
\(=\frac{1}{4}.\frac{7}{3}.30.\frac{1}{2}.\frac{8}{45}\)
\(=\frac{14}{9}\)
\(0,25.2\frac{1}{3}.30.0,5.\frac{8}{45}\)
\(=0,25.\frac{7}{3}.30.0,5.\frac{8}{45}\)
\(=\frac{7}{12}.30.\frac{4}{45}\)
\(\frac{35}{2}.\frac{4}{45}\)
\(=\frac{14}{9}\)
1. Giải các phương trình
b) 3+ (x-5)=2(3x-2) c) 2(x-0.5)+3=0.25(4x-1)
d) 2(x-\(\dfrac{1}{4}\))-4=-6(-\(\dfrac{1}{3}\)x+0.5)+2
b) Ta có: \(3+\left(x-5\right)=2\left(3x-2\right)\)
\(\Leftrightarrow3+x-5=6x-4\)
\(\Leftrightarrow x-2-6x+4=0\)
\(\Leftrightarrow-5x+2=0\)
\(\Leftrightarrow-5x=-2\)
\(\Leftrightarrow x=\dfrac{2}{5}\)
Vậy: \(S=\left\{\dfrac{2}{5}\right\}\)
c) Ta có: \(2\left(x-0.5\right)+3=0.25\left(4x-1\right)\)
\(\Leftrightarrow2x-1+3=x-\dfrac{1}{4}\)
\(\Leftrightarrow2x+2-x+\dfrac{1}{4}=0\)
\(\Leftrightarrow x+\dfrac{9}{4}=0\)
\(\Leftrightarrow x=-\dfrac{9}{4}\)
Vậy: \(S=\left\{-\dfrac{9}{4}\right\}\)
d) Ta có: \(2\left(x-\dfrac{1}{4}\right)-4=-6\left(-\dfrac{1}{3}x+0.5\right)+2\)
\(\Leftrightarrow2x-\dfrac{1}{2}-4=2x-3+2\)
\(\Leftrightarrow2x-\dfrac{9}{2}=2x-1\)
\(\Leftrightarrow2x-2x=-1+\dfrac{9}{2}\)
\(\Leftrightarrow0x=\dfrac{7}{2}\)(vô lý)
Vậy: \(S=\varnothing\)
b.
→ -2 + x = 6x - 4
→ -2 + 4 = 6x - x
→ 2 = 5x
→ x = \(\dfrac{2}{5}\)
Vậy, phương trình có tập nghiệm S = {\(\dfrac{2}{5}\)}
2(x-0.5)+3=0.25(4x-1)
Bài làm:
\(2\left(x-0,5\right)+3=0,25\left(4x-1\right)\)
\(\Leftrightarrow2x-1+3=x-0,25\)
\(\Leftrightarrow2x-x=1-3-0,25\)
\(\Leftrightarrow x=-2,25\)
Vậy phương trình có tập nghiệm là \(S=\left\{-2,25\right\}\)
x : 0.25 + x : 0.5 + x + x : 0.01 = 321
x : 0,25 + x : 0,5 + x + x : 0,01 = 321
\(x\times4+x\times2+x+x\times100=321\)
\(x\times\left(4+2+1+100\right)=321\)
\(x\times107=321\)
\(x=321:107\)
x = 3
x : 0,25 + x : 0,5 + x + x : 0,01 = 321
x * 4 + x * 2 + x *1 + x * 100 = 321
x * ( 4 + 2 + 1 + 100 ) = 321
x * 107 = 321
x = 321 : 107
x = 3
* là dấu nhân nha
x:0.25+x:0.5+x+x:0.01=321
X x 4 + X x 2 + X + X x 100 = 321
X x (4 + 2 + 1 + 100) = 321
X x 107 = 321
X = 321 : 107
X = 3
<=>x:(0,25+0,5+0,01)=321
<=>x:0,76=321
<=>x=321x0,76
<=>x=243,96
x : 0.25 + x : 0.5 + x + x : 0.01 = 321
x : 0,25 + x : 0.5 + x + x : 0.01 = 321
x * 4 + x * 2 + x * 1 + x * 100 = 321
x * ( 4 + 2 + 1 + 100 ) = 321
x * 107 = 321
x = 321 : 107
x = 3
x : 0.25 + x : 0.5 + x + x :0.01 = 214
x:0.25=4x
x:0.5=2x
x:0.01=100x
=>4x+2x+x+100x=214
=>107x=214
=>x=2
x : 0.25 + x : 0.5 + x + x :0.01 = 214
x : ( 0,25 + 0,5 + 0,01 ) = 214
x : 0, 31 = 214
x= 214 x 0,31
x =66,34
<=>x.4+x.2+x+x.100=214
<=>x(4+2+1+100)=214
<=>x.107=214
<=>x=2
vậy x=2
X:0.25+X:0.125+X:0.5=1.4
=>\(x\times4+x\times8+x\times2=1,4\)
\(\Rightarrow x\times\left(4+8+2\right)=1,4\)
\(\Rightarrow x\times14=1,4\)
\(\Rightarrow x=1,4\div14\)
\(\Rightarrow x=0,1\)
x : 0,25 + x : 0,125 + x : 0,5 = 1,4
x : ( 0,25 + 0,125 + 0,5 ) = 1,4
x : 0,875 = 1,4
x = 1,4 x 0,875
x = 1,225
Chúc bn hc tốt <3
X : 0,25 + X : 0,125 + X : 0,5 = 1,4
=> X x 4 + X x 8 + X x 2 = 1,4
=> X x ( 4 + 8 + 2 ) = 1,4
=> X x 14 = 1,4
=> X = 1,4 : 14
=> 0,1
x/0.5+x/0.25+x/0.1=16