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Trả lời :
x : 15 . 4 = 40 72 : x . 11 = 198
x : 15 = 40 : 4 72 : x = 198 : 11
x : 15 = 10 72 : x = 18
x = 10 x 15 x = 72 : 18
x = 150 x = 4
- Study well -
Trả lời :
x: 15x4 = 40
x: 60 =40
x =40x 60
x = 2400
72 : X x 11=198
72:X =198:11
72:X = 18
X =72: 18
X =4
~~~Học tốt ~~~
1) 1/2*1/6=1/12 ; 1/3*1/4=1/12. Ta có : 17/5+1/12*71/5-1/12*28/5=1/12*(17/5+71/5-28/5)=1/12*60/5=1/12*12=1 2)1/10+4/20+9/30+16/40+25/50 =1/10+2/10+3/10+4/10+5/10(rút gọn) =15/10=3/2 3)18/15*(2525/3636+1515/1818-2020/7272)=6/5*(25/36+5/6-5/18)(rút gọn)=6/5*25/36+6/5*5/6-6/5*5/18=5/6+1-1/3=9/6=3/2.
a) 2/3 = 12/18 => x = 18
b) 14/56 = 1/4 => x = 4
c) 2/5 = 50/125 => x = 50
a)\(\frac{2}{3}=\frac{12}{x}\)
\(\frac{2\cdot6}{3\cdot6}=\frac{12}{x}\)
\(\frac{12}{18}=\frac{12}{x}\)
x=12
b)\(\frac{14}{56}=\frac{1}{x}\)
\(\frac{14\div14}{56\div14}=\frac{1}{x}\)
\(\frac{1}{4}=\frac{1}{x}\)
x = 4
c)\(\frac{x}{125}=\frac{2}{5}\)=
\(\frac{x}{125}=\frac{2\cdot25}{5\cdot25}\)
\(\frac{x}{125}=\frac{50}{125}\)
x = 50
a) 7 / 25 : 14 / 5 + 15 /4 x 1/ 5
b) 4 / 7 x 21/ 8 - 1/ 7: 14 / 5
zúp mk nha . nhanh mk tick . thanks
\(a)\frac{7}{25}:\frac{14}{5}+\frac{15}{4}\times\frac{1}{5}\)
\(=\frac{7}{25}\times\frac{5}{14}+\frac{15}{4}\times\frac{1}{5}\)
\(=\frac{1}{10}+\frac{3}{4}\)
\(=\frac{17}{20}\)
\(b)\frac{4}{7}\times\frac{21}{8}-\frac{1}{7}:\frac{14}{5}\)
\(=\frac{4}{7}\times\frac{21}{8}-\frac{1}{7}\times\frac{5}{14}\)
\(=\frac{3}{2}-\frac{5}{98}\)
\(=\frac{71}{49}\)
b4/7x21/8-1/7:14/5
=4/7x21/8-1/7x5/14
=84/56-5/98
=3/2-5/98
=71/49
mk giải câu b thôi nha
Số x là:
12345:(6-5)x6=74070
Số y là:
74070-12345-61725
Đáp số:..........
1.
\(\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1=1\)
\(\frac{2}{7}\cdot\frac{1}{5}+\frac{2}{7}\cdot\frac{4}{5}=\frac{2}{7}\cdot\left(\frac{1}{5}+\frac{4}{5}\right)=\frac{2}{7}\cdot1=\frac{2}{7}\)
#Louis
\(1.a)\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(b)\frac{2}{7}\times\frac{1}{5}+\frac{2}{7}\times\frac{4}{5}\)
\(=\frac{2}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)\)
\(=\frac{2}{7}\times1\)
\(=\frac{2}{7}\)
\(2.a)\frac{5}{6}+\frac{7}{12}-\frac{2}{9}\)
\(=\frac{30}{36}+\frac{21}{36}-\frac{8}{36}\)
\(=\frac{43}{36}\)
\(b)\frac{4}{9}\times\frac{5}{8}+\frac{1}{6}\)
\(=\frac{5}{18}+\frac{1}{6}=\frac{5}{18}+\frac{3}{18}\)
\(=\frac{8}{18}=\frac{4}{9}\)
\(c)2:\frac{3}{11}-\frac{13}{12}\)
\(=2\times\frac{11}{3}-\frac{13}{12}\)
\(=\frac{22}{3}-\frac{13}{12}\)
\(=\frac{25}{4}\)
125x[x+3]=9871
x+3 =9871:125
x+3=78,968
x=78,968-3
x=75,968
k mik nhe
125 x ( x + 3) = 9871
x + 3 = 9871 : 125
x + 3 = 78,968
x = 78,968 - 3
x = 75,968