a) x/17=60/204 b)6+x/33=7/11
đầu bài là tìm x biết
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a} x/17 = 60/204
=> x/17 = 5/17
=> x = 5
Vậy x = 5
b} 6 + x / 33 = 7/11
=> 6 + x / 33 = 21/33
=> 6 + x = 21
=> x = 21 - 6 = 15
Vậy x = 15
b;\(\frac{x}{17}=\frac{60}{204}\)
=> \(x=60.17:204=5\)
c; \(6+\frac{x}{33}=\frac{7}{11}\)
=> \(6=\frac{7}{11}-\frac{x}{33}\)
=> \(6=\frac{21}{33}-\frac{x}{33}\)
=> \(6=\frac{21-x}{33}\)
=> \(21-x=198\)
=> \(x=21-198\)
=> \(x=-117\)
\(a,\frac{x}{17}=\frac{60}{204}\Rightarrow x=\frac{60.17}{204}=5\)
\(b.6+\frac{x}{33}=\frac{7}{11}\)
\(\Leftrightarrow\frac{x}{33}=-\frac{59}{11}\)
\(\Rightarrow x=\frac{-59.33}{11}=-177\)
\(c,12+\frac{x}{43-x}=\frac{2}{3}\)
\(\Leftrightarrow\frac{x}{43-x}=-\frac{34}{3}\)
\(\Leftrightarrow3x=-1462+34x\)
\(\Leftrightarrow-31x=-1462\)
\(\Leftrightarrow x=\frac{1462}{31}\)
\(d,1< \frac{6}{x}< 2\)
\(\Leftrightarrow\frac{1}{6}< x< \frac{1}{3}\)
Mình vẫn chưa hiểu , bạn giải theo kiểu lớp 4 được không?
Bài 6:
\(21,251+6,058+0,749+1,042\)
\(=\left(21,251+0,749\right)+\left(6,058+1,042\right)\)
\(=22+7,1\)
\(=29,1\)
___________________
\(1,53+5,309+12,47+5,691\)
\(=\left(1,53+12,47\right)+\left(5,309+5,691\right)\)
\(=14+11\)
\(=25\)
5:
a: =>x/17=5/17
=>x=5
b; =>6+x=7/11*33=21
=>x=15
c: \(\dfrac{12+x}{43-x}=\dfrac{2}{3}\)
=>3x+36=86-2x
=>5x=50
=>x=10
d: \(\dfrac{x}{5}< \dfrac{3}{7}\)
=>x<3/7*5
=>x<15/7
f: 15/26+x/16=46/52
=>x/16=23/26-15/26=8/26=4/13
=>x=4/13*16=64/13
A/ \(\frac{x}{17}=\frac{60}{204}\)
\(204x=60.17\)
\(204x=1020\)
\(x=\frac{1020}{204}\)
\(x=\frac{17}{4}=4,25\)
vậy x= 4,25
B/ \(\left(6+x\right).11=33.7\)
\(66+11x=231\)
\(11x=231-66=165\)
\(x=\frac{165}{11}\)
\(x=15\)
vậy x = 15
C/ \(\left(12+x\right).3=\left(43-x\right).2\)
\(36+3x=86-2x\)
\(3x+2x=86-36\)
\(5x=50\)
\(x=\frac{50}{5}=10\)
vậy x=10
a)\(\frac{x}{17}=\frac{60}{204}=\frac{5}{17}\Rightarrow x=5\)
b)\(\frac{6+x}{33}=\frac{7}{11}\Rightarrow11\left(6+x\right)=7.33\Rightarrow11.6+11x=231\Rightarrow66+11x=231\)
\(\Rightarrow11x=231-66\Rightarrow11x=165\Rightarrow x=\frac{165}{11}=15\)
c)\(\frac{12+x}{43-x}=\frac{2}{3}\Rightarrow2\left(43-x\right)=3\left(12+x\right)\Rightarrow2.43-2x=3.12+3x\)
\(86-2x=36+3x\Rightarrow86-36=3x+2x\Rightarrow50=5x\Rightarrow x=\frac{50}{5}=10\)
a) ta có : 60/204= 60:12/204:12 =5/7
suy ra : x = 5
b) 7/11 = 7x3/11x3 = 21/33
suy ra 6+x = 21
x = 21 -6
x = 15
ý c) bạn làm tương tự nhé
\(a)\frac{x}{17}=\frac{60}{204}\)
\(x=\frac{60.17}{204}\)
\(\Rightarrow5\)
\(b)6+\frac{x}{33}=\frac{7}{11}\)
\(\frac{x}{33}=\frac{7}{11}-6\)
\(\frac{x}{33}=\frac{-59}{11}\)
\(x=\frac{\left(-59\right).33}{11}\)
\(\Rightarrow x=-177\)