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a) 12/17 + 21/25 = 657/425
b) 4 - 205/811 = 3039/811
c) 12 . 21/25 = 252/25
d) 4 : 205/811 = 205/3244
a) 12/17 + 21/25 = 657/425
b) 4 - 205/811 = 3039/811
c) 12 . 21/25 = 252/25
d) 4 : 205/811 = 205/3244
a, 5 x ( 4 + 6 x X ) = 290
4 + 6 x X = 290 : 5
4 + 6 x X = 58
6 x X = 58 - 4
6 x X = 54
X = 54 : 6
X = 9
b, ( 15 x 24 - X ) : 0,25 = 100 : \(\frac{1}{4}\)
( 15 x 24 - X ) : 0,25 = 400
15 x 24 - X = 400 x 0,25
15 x 24 - X = 100
360 - X = 100
X = 360 - 100
X = 260
c) X x 4,8 + 5,2 x X = 160
X x ( 4,8 + 5,2 ) = 160
X x 10 = 160
X = 160 : 10
X = 16
d) \(\frac{17}{5}:x=\frac{34}{5}:\frac{4}{3}\)
\(\frac{17}{5}:x=\frac{51}{10}\)
\(x=\frac{17}{5}:\frac{51}{10}\)
\(x=\frac{2}{3}\)
Chính xác đến 100 %
Học tốt #
a) x + 2/3=9/11
<=> x=9/11-2/3= 5/33
b) x - 3/10=4/15
<=> x=4/15+3/10=17/30
c) X x 1/7=5/6
<=> x=5/6:1/7=35/6
d) x : 3/5=1/6
<=> x=1/6x3/5=1/10
\(a,x+\frac{2}{3}=\frac{9}{11}\)
\(x=\frac{9}{11}-\frac{2}{3}\)
\(x=\frac{5}{33}\)
\(b,x-\frac{3}{10}=\frac{4}{15}\)
\(x=\frac{4}{15}+\frac{3}{10}\)
\(x=\frac{17}{30}\)
\(c,x\cdot\frac{1}{7}=\frac{5}{6}\)
\(x=\frac{5}{6}:\frac{1}{7}\)
\(x=\frac{35}{6}\)
\(d,x:\frac{3}{5}=\frac{1}{6}\)
\(x=\frac{1}{6}\cdot\frac{3}{5}\)
\(x=\frac{1}{10}\)
. là nhân nha
a) (x + 1,2) : 2,5 = 5
x + 1,2 = 5 . 2,5
x + 1,2 = 12,5
x = 12,5 - 1,2
x = 11,3
Vậy x = 11,3
\(b)4,25.x=53,38\)
\(x=53,38:4,25\)
\(x=12,56\)
Vậy x = 12,56
\(c)x.\frac{1}{2}+\frac{3}{4}=1\)
\(x.\frac{1}{2}=1-\frac{3}{4}\)
\(x.\frac{1}{2}=\frac{1}{4}\)
\(x=\frac{1}{4}:\frac{1}{2}\)
\(x=\frac{1}{2}\)
Vậy \(x=\frac{1}{2}\)
\(d)\frac{2}{7}+\frac{5}{7}:x=5-\frac{1}{7}\)
\(\frac{2}{7}+\frac{5}{7}:x=\frac{34}{7}\)
\(\frac{5}{7}:x=\frac{34}{7}-\frac{2}{7}\)
\(\frac{5}{7}:x=\frac{32}{7}\)
\(x=\frac{5}{7}:\frac{32}{7}\)
\(x=\frac{5}{32}\)
Vậy \(x=\frac{5}{32}\)
e) x - 2448 : 24 = 102
x - 102 = 102
x = 102 + 102
x = 204
Vậy x = 204
\(a.=2,35\times\left(7+3\right)\)
\(=2,35\times10\)
\(=23,5\)
\(b.=6,75\times\left(12-2\right)\)
\(=6,75\times10\)
\(=67,5\)
\(c.=25\times4\times37,65\)
\(=100\times37,65\)
\(=3765\)
\(d.=20:2\times16,47\)
\(=10\times16,47\)
\(=164,7\)
a, 45,651 x ( 73 + 20 + 7 )
= 45,651 x 100
= 4565,1
b, 35 . 11 . 0,1 + 0,25 . 100 . 0
= 35 . 1,1 + 0
= 38,5
\(1,\) \(45:0,5-\frac{9}{4}:\frac{1}{2}\)
\(=90-\frac{9}{2}\)
\(=\frac{171}{2}\)
\(2,\)\(42+\frac{9}{2}:0,75-14,5\)
\(=42+6-14,5\)
\(=33,5\)
\(3,\)\(125\%\times\frac{3}{4}-25\%\)
\(=\frac{15}{16}-\frac{1}{4}\)
\(=\frac{11}{16}\)
\(4,\)\(\frac{19}{5}:75\%+50\%:\frac{5}{4}\)
\(=\frac{76}{15}+\frac{2}{5}\)
\(=\frac{82}{15}\)
\(5,\)\(Y\times25,5-42=48,5\)
\(\Leftrightarrow Y\times25,5=90,5\)
\(\Leftrightarrow Y=90,5:25,5\)
\(\Leftrightarrow Y=\frac{181}{51}\)
Vậy ...
\(6,\)\(1,25\times Y\times25=105,8\)
\(\Leftrightarrow31,25\times Y=105,8\)
\(\Leftrightarrow Y=105,8:31,25\)
\(\Leftrightarrow Y=3,3856\)
Vậy ...
_Chúc bạn học tốt_
a)(x-13)-17=0
=>X-13. = 0+17
=>x-13. =17
=>x. = 17+13
=>x. = 30
b)315+(125-x)=435
=>(125-x). =435-315
=>(125-x). =120
=>.x. = 5
c)575-(6x+70)=445
=>(6x+70). =575-445
=> (6x+70). =130
=>. 6x. =130-70
=>6x. =60
=>x. =60:6
=>X. =10
a) (x-13)-17=0 (x-13) =0+17 x-13 =17 x = 17+13 x =30