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a) 72/45 x 35/36= 8/5 x 35/36 =280/180=14/9.
b)1/2:3/4+1/6:3/4 =(1/2+1/6) : 3/4 =8/12:3/4 = 24/36=2/3
c) 2/3x4/5+1/3=2/3+1/3x4/5+1/3=4/3x4/15=16/45.
Nếu sai thông cảm cho mình nhé. Bạn ko k cũng ko sao đâu.
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
theo mình nghĩ là
( 112 x 115 ) x ( 113 x 114 ) x 116
sai thì cho xin lỗi nha bn
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
\(1.a)\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(b)\frac{2}{7}\times\frac{1}{5}+\frac{2}{7}\times\frac{4}{5}\)
\(=\frac{2}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)\)
\(=\frac{2}{7}\times1\)
\(=\frac{2}{7}\)
\(2.a)\frac{5}{6}+\frac{7}{12}-\frac{2}{9}\)
\(=\frac{30}{36}+\frac{21}{36}-\frac{8}{36}\)
\(=\frac{43}{36}\)
\(b)\frac{4}{9}\times\frac{5}{8}+\frac{1}{6}\)
\(=\frac{5}{18}+\frac{1}{6}=\frac{5}{18}+\frac{3}{18}\)
\(=\frac{8}{18}=\frac{4}{9}\)
\(c)2:\frac{3}{11}-\frac{13}{12}\)
\(=2\times\frac{11}{3}-\frac{13}{12}\)
\(=\frac{22}{3}-\frac{13}{12}\)
\(=\frac{25}{4}\)
\(\frac{4}{5}\)x\(\frac{9}{2}\)x\(\frac{2}{9}\)x\(\frac{5}{4}\)
=\(\frac{36}{10}\)x\(\frac{10}{36}\)
=1
\(\dfrac{3}{4}\cdot\dfrac{2}{5}+\dfrac{3}{4}\cdot\dfrac{2}{5}\)
\(=\dfrac{3}{4}\cdot\dfrac{2}{5}\left(1+1\right)\)
\(=\dfrac{6}{20}\cdot2\)
\(=\dfrac{12}{20}=\dfrac{3}{5}\)