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a)
x - 7,84 = 4,16
x = 4,16 + 7,84
x = 12
b)
(x + 1/4) : 0,01 - (0,75 x 4) = 60
(x + 1/4) : 0,01 - 3 = 60
(x + 1/4) : 0,01 = 63
(x+ 1/4) = 0,63
x = 19/50
\(71+65\times4=\left(x+140\right):x+260\)
\(71+260=\left(x+140\right):x+260\)
\(71+260-260=\left(x+140\right):x\)
\(71=\left(x+140\right):x\)
\(71x=x+140\)
\(71x-x=140\)
\(70x=140\)
\(x=2\)
\(71+260=\frac{x+140}{x}+260\)
\(\frac{x+140}{x}=71+260-260=71\)
\(x+140=71x\)
\(x-71x=-140\)
\(-70x=-140\)
\(x=\frac{-140}{-70}=2\)
Vậy \(x=2\)
a. \(\frac{5}{12}:x=\left(\frac{5}{6}-\frac{1}{2}\right)\times\frac{5}{4}\)
\(=>\)\(\frac{5}{12}:x=\frac{1}{3}\times\frac{5}{4}=\frac{5}{12}\)
\(=>x=\frac{5}{12}:\frac{5}{12}=1\)
b.\(x:0,15=\left(2,8+0,38\right):0,75\)
\(=>x:0,15=3,18:0,75=4,24\)
\(=>x=4,24\times0,15=0,636\)
(792,36 x 0,75 + 792,36 : 4) : (7,2 : 0,1 : 10)
= (792,36 x 0,75 + 792,36 x 0,25) : (7,2 x 10 : 10)
= [792,36 x (0,75 + 0,25)] : 7,2
= [792,36 x 1] : 7,2
= 792,36 : 7,2
= 110,05
2 x 4 x 8 x 0,5 x 0,125 x 0,25 x (0,4321 + 0,5679)
= 2 x 4 x 8 : 2 : 8 : 4 x 1
= (2 : 2) x (4 : 4) x (8 : 8) x 1
= 1 x 1 x 1 x 1
= 1
3,7 x 3,8 + 8,3 x 3,7 - 0,4 x 3,7 x 5
= 3,7 x (3,8 + 8,3 - 0,4 - 5)
= 3,7 x 6,7
= 24,79
2,5 x 9,5 x 4 + 19,5 x 10
= (2,5 x 4) x 9,5 + 19,5 x 10
= 10 x 9,5 + 19,5 x 10
= 95 + 195
= 290
kick mik nhé
0,25 x\(\frac{1}{100}\)+ 0,75 x 0,01
= 0,25 x 0,01 + 0,75 x 0,01
= (0,25 + 0,75) x 0,01
= 1 x 0,01
= 0,01
Chúc bạn học tốt.
😁😁😁
\(180-\left(x-45\right)\div2=120\)
\(\left(x-45\right)\div2=180-120\)
\(\left(x-45\right)\div2=60\)
\(x-45=60\times2\)
\(x-45=120\)
\(x=120+45\)
\(x=165\)
\(\left(2009-x\right)\div29+32=100\)
\(\left(2009-x\right)\div29=100-32\)
\(\left(2009-x\right)\div29=68\)
\(2009-x=68\times29\)
\(2009-x=1972\)
\(x=2009-1972\)
\(x=37\)
\(\left(x-2\right)\times3-270\div45=120\)
\(\left(x-2\right)\times3-6=120\)
\(\left(x-2\right)\times3=120+6\)
\(\left(x-2\right)\times3 =126\)
\(x-2=126\div3\)
\(x-2=42\)
\(x=42+2\)
\(x=44\)
\(\left(x+0,2\right)+\left(x+0,7\right)+\left(x+1,2\right)+...+\left(x+4,2\right)+\left(x+4,7\right)=65,5\)
\(\left(x+x+x+..+x+x\right)+\left(0,2+0,7+1,2+...+4,2+4,7\right)=65,5\)
\(10x+\frac{\left(0,2+4,7\right)\times10}{2}=65,5\)
\(10x+24,5=65,5\)
\(10x=65,5-24,5\)
\(10x=41\)
\(\Rightarrow x=4,1\)
x - 7.84 = 64% x (2,8 + 3,7)
<=> x - 7.84 = 0,64 x 6.5
<=> x - 7,84 = 4,16
<=> x = 4,16 + 7,84 = 12
(x + \(\frac{1}{4}\) ) : 0,01 - (0,75x4) = 60
<=> (x + \(\frac{1}{4}\) ) x 100 - 3 =60
<=> 100x + 25 - 3 =60
<=> 100x = 38
<=> x = \(\frac{19}{50}\)
a, x - 7,84 = 64% x ( 2,8 + 3,7 )
x - 7,84 = 64% x 6,5
x - 7,84 = 41,6
x = 41,6 + 7,84
x = 49,44
b, ( x + 1/4 ) : 0,01 - ( 0,75 x 4 ) = 60
( x + 0,25 ) : 0,01 - 3 = 60
( x + 0,25 ) : 0,01 = 60 + 3
( x + 0,25 ) : 0,01 = 63
x + 0,25 = 63 x 0,01
x + 0,25 = 0,63
x = 0,63 - 0,25
x = 0,38