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\(x+\frac{1}{2}=\frac{1}{3}\)
=> \(x=\frac{1}{3}-\frac{1}{2}=\frac{2}{6}-\frac{3}{6}=\frac{-1}{6}\)
\(x\cdot\frac{1}{3}-\frac{1}{2}=\frac{1}{2}\)
=> \(x\cdot\frac{1}{3}=\frac{1}{2}+\frac{1}{2}=1\)
\(x=1:\frac{1}{3}=3\)
\(x\cdot\frac{1}{2}+x\cdot\frac{1}{3}=\frac{1}{6}\)
=> \(x\left(\frac{1}{2}+\frac{1}{3}\right)=\frac{1}{6}\)
=> \(x\cdot\frac{5}{6}=\frac{1}{6}\)
=> \(x=\frac{1}{6}:\frac{5}{6}=\frac{1}{6}\cdot\frac{6}{5}=\frac{1}{5}\)
\(x:\frac{2}{3}+x:\frac{1}{5}=6\)
=> \(x\cdot\frac{3}{2}+x\cdot5=6\)
=> \(x\cdot\left(\frac{3}{2}+5\right)=6\)
=> \(x\cdot\frac{13}{2}=6\)
=> \(x=6:\frac{13}{2}=6\cdot\frac{2}{13}=\frac{12}{13}\)
P/S : Dấu " ." đây là dấu nhân nhé , cấp 2 mới sử dụng
Nhưng mà bạn lớp 4 nên ghi dấu nhân ở trên đề ( có dấu " x " đó)
bạn huỳnh quang sang ơi, sai đề rồi bạn ak
X + 3/2 = 4/3
nhầm câu đầu nha
TL :
1 + 1 + 2 + 2 + 3 + 3 + 4 + 4 + 5 + 5 + 6 + 6 + 7 + 7 + 8 + 8 + 9 + 9 = 90
HT
rút gọn phân số :
4/5+21/15=4/5+7/5=11/5
8/9-25/45=8/9-5/9=3/9
tính :
5/6+2/7+15/6=5/6+15/6+2/7
=10/3+2/7=76/21
7/8-9/6.7/8=7/8-21/16=-7/16
chúc bạn học tốt !!!
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
\(1.a)\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(b)\frac{2}{7}\times\frac{1}{5}+\frac{2}{7}\times\frac{4}{5}\)
\(=\frac{2}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)\)
\(=\frac{2}{7}\times1\)
\(=\frac{2}{7}\)
\(2.a)\frac{5}{6}+\frac{7}{12}-\frac{2}{9}\)
\(=\frac{30}{36}+\frac{21}{36}-\frac{8}{36}\)
\(=\frac{43}{36}\)
\(b)\frac{4}{9}\times\frac{5}{8}+\frac{1}{6}\)
\(=\frac{5}{18}+\frac{1}{6}=\frac{5}{18}+\frac{3}{18}\)
\(=\frac{8}{18}=\frac{4}{9}\)
\(c)2:\frac{3}{11}-\frac{13}{12}\)
\(=2\times\frac{11}{3}-\frac{13}{12}\)
\(=\frac{22}{3}-\frac{13}{12}\)
\(=\frac{25}{4}\)
Bai 1 :
5/18<2/3<7/9<5/6
Bai 2 :
A=15/16
B=1/10
C=5/24
D=5/7 tick nha tranvanloc
Câu 1
A=21/4
B=3/16
C=41/8
D=1/2
Câu 2
Phải trồng tất cả:
280:70=4(cây)
Tick đi
a )3/4+3/4:(2/3:2-1/6)
=3/2 : 1/3-1/6
=3/2 : 1/6
=9
b) 3/4-3/4:(2/3:2x4)
= 0 :1/3 x4
= 0 : 4/3
= 0
c ) 7-8/4+3/4:6
=5 +1/8
=41/8
d)4:5/4-3+3/10
=16/5 -33/10
= - 1/10
2 giải phải trồng cột là:
280:70=4( cột )
ĐS : 4 cột
tick nha
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16
= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8
= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)
= 1 + 1 + 7/4
= 2 + 7/4 = 15/4
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16
= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2
= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2
= 14/7 + 12/6 + 5/8 + 1/2
= 2 + 2 + 5/8 + 1/2
= 4 + 9/8 = 41/8
Bài 1:
\(\dfrac{2}{3}\) + \(\dfrac{3}{4}\) - \(\dfrac{2}{5}\)
=\(\dfrac{40}{60}\) + \(\dfrac{45}{60}\) - \(\dfrac{24}{60}\)
= \(\dfrac{61}{60}\)
b; \(\dfrac{12}{13}\) x \(\dfrac{3}{4}\) - \(\dfrac{7}{13}\)
= \(\dfrac{9}{13}\) - \(\dfrac{7}{13}\)
= \(\dfrac{2}{13}\)
c; \(\dfrac{15}{17}\) : \(\dfrac{19}{34}\) - \(\dfrac{17}{19}\)
= \(\dfrac{15}{17}\) x \(\dfrac{34}{19}\) - \(\dfrac{17}{19}\)
= \(\dfrac{30}{19}\) - \(\dfrac{17}{19}\)
= \(\dfrac{13}{19}\)
Bài 2:
a; \(\dfrac{x}{5}\) x \(\dfrac{3}{7}\) = \(\dfrac{9}{35}\)
\(\dfrac{x}{5}\) = \(\dfrac{9}{35}\) : \(\dfrac{3}{7}\)
\(\dfrac{x}{5}\) = \(\dfrac{3}{5}\)
\(x\) = \(\dfrac{3}{5}\) x 5
\(x\) = 3
Bài 1:
a, \(\frac{1}{7}+3+\frac{5}{6}=\frac{1}{7}+\frac{3}{1}+\frac{5}{6}=\frac{6}{42}+\frac{126}{42}+\frac{35}{42}=\frac{167}{42}\)
b, \(\frac{4}{7}+\frac{5}{9}+4=\frac{4}{7}+\frac{5}{9}+\frac{4}{1}=\frac{36}{63}+\frac{35}{63}+\frac{252}{63}=\frac{323}{63}\)
Tính trong ngoặc trước ngoài ngoặc sau :w
\(\frac{5}{2}\times\left(\frac{3}{7}+\frac{1}{5}\right)\)
\(=\frac{5}{2}\times\frac{3}{7}+\frac{5}{2}\times\frac{1}{5}\)
\(=\frac{15}{14}\times\frac{1}{2}\)
\(=\frac{15}{28}\)