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Bài làm :
\(a,\frac{1}{7}+\frac{3}{4}+\frac{2}{7}+\frac{4}{7}\)
\(=\left(\frac{1}{7}+\frac{2}{7}+\frac{4}{7}\right)+\frac{3}{4}\)
\(=1+\frac{3}{4}\)
\(=\frac{7}{4}\)
\(b,\frac{4}{7}:\frac{2}{5}+\frac{3}{7}:\frac{2}{5}-\frac{7}{9}\)
\(=\left(\frac{4}{7}+\frac{3}{7}\right):\frac{2}{5}-\frac{7}{9}\)
\(=1:\frac{2}{5}-\frac{7}{9}\)
\(=\frac{5}{2}-\frac{7}{9}\)
\(=\frac{31}{18}\)
Học tốt
\(a,\frac{1}{7}+\frac{3}{4}+\frac{2}{7}+\frac{4}{7}\)
\(=\left(\frac{1}{7}+\frac{2}{7}+\frac{4}{7}\right)+\frac{3}{4}\)
\(=1+\frac{3}{4}\)
\(=\frac{7}{4}\)
\(b,\frac{4}{7}:\frac{2}{5}+\frac{3}{7}:\frac{2}{5}-\frac{7}{9}\)
\(=\left(\frac{4}{7}+\frac{3}{7}\right):\frac{2}{5}-\frac{7}{9}\)
\(=1:\frac{2}{5}-\frac{7}{9}\)
\(=\frac{5}{2}-\frac{7}{9}\)
\(=\frac{31}{18}\)
2/3 : 1/2 + 1/3 : 1/2
= 4/3 + 2/3
= 2
3/5 : 4/7 : 7/6
= 21/20 : 7/6
= 9/10
4/9 x 7/5 : 7/9
= 28/45 : 7/9
= 4/5
Em nhớ k anh nha
có thể tính nốt phép tính 3/4 x 3/2 + 3/4 x 1/2 có đc ko ạ
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
\(1.a)\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(b)\frac{2}{7}\times\frac{1}{5}+\frac{2}{7}\times\frac{4}{5}\)
\(=\frac{2}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)\)
\(=\frac{2}{7}\times1\)
\(=\frac{2}{7}\)
\(2.a)\frac{5}{6}+\frac{7}{12}-\frac{2}{9}\)
\(=\frac{30}{36}+\frac{21}{36}-\frac{8}{36}\)
\(=\frac{43}{36}\)
\(b)\frac{4}{9}\times\frac{5}{8}+\frac{1}{6}\)
\(=\frac{5}{18}+\frac{1}{6}=\frac{5}{18}+\frac{3}{18}\)
\(=\frac{8}{18}=\frac{4}{9}\)
\(c)2:\frac{3}{11}-\frac{13}{12}\)
\(=2\times\frac{11}{3}-\frac{13}{12}\)
\(=\frac{22}{3}-\frac{13}{12}\)
\(=\frac{25}{4}\)
a) \(134\times4\times5\)
\(=134\times\left(4\times5\right)\)
\(=134\times20\)
\(=2680\)
b) \(5\times36\times2\)
\(=\left(5\times2\right)\times36\)
\(=10\times36\)
\(=360\)
c) \(42\times2\times7\times5\)
\(=42\times7\times\left(2\times5\right)\)
\(=42\times7\times10\)
\(=42\times(7\times10)\)
\(=42\times70\)
\(=2940\)
a) 4,5 x 5,5 + 4,7 x 4,5
=4,5 x (5,5 +4,7)
=4,5 x 10,2
= 45,9
b) 7,5 x 2,5 x 0,04
=7,5 x (2,5 x 0,04)
=7,5 x 0,1
=0,75
c) 73,5 x 35, 64 ÷ 73,5 x 64,36
=73,5 x(35,64+64,36)
= 73,5 x 100
= 7350
d) 3,12 x 8 x 1,25
=3,12 x (8 x 1,25)
=3,12 x 10
= 31,2
e)6,48 x 11, 25 - 6,48 x 1,25
=6,48 x (11,25 -1,25)
= 6,48x 10
=64,8
f)3,67 x 58,35 + 58,35 x 6,33
=58,35 x (3,67+6,33)
= 58,35x 10
=583,5
You're welcome :))
A) \(4,5\times5,5+4,7\times4,5\)
\(=4,5\times\left(5,5+4,7\right)\)
\(=4,5\times10,2\)
\(=45,9\)
B) \(7,5\times2,5\times0,04\)
\(=7,5\times\left(2,5\times0,04\right)\)
\(=7,5\times0,1\)
\(=0,75\)
C) \(73,5\times35,64+73,5\times64,36\)
\(=73,5\times\left(35,64+64,36\right)\)
\(=73,5\times100\)
\(=7350\)
D) \(3,12\times8\times1,25\)
\(=3,12\times\left(8\times1,25\right)\)
\(=3,12\times10\)
\(=31,2\)
E) \(6,48\times11,25-6,48\times1,25\)
\(=6,48\times\left(11,25-1,25\right)\)
\(=6,48\times10\)
\(=64,8\)
F) \(3,67\times58,35+58,35\times6,33\)
\(=\left(3,67+6,33\right)\times58,35\)
\(=10\times58,35\)
\(=583,5\)
* Lần sau bạn tách câu hỏi ra để dễ giải hơn nhé *
Hc tốt
@Duongg
a, \(\frac{5}{11}\times\frac{7}{25}+\frac{15}{11}\times\frac{1}{5}\)
\(=\frac{5}{11}\times\frac{7}{25}+\frac{5}{11}\times\frac{3}{5}\)
\(=\frac{5}{11}\times\left(\frac{7}{25}+\frac{3}{5}\right)\)
\(=\frac{5}{11}\times\frac{22}{25}\)
\(=\frac{2}{5}\)
b, \(\frac{3}{7}\times\frac{25}{19}-\frac{1}{7}\times\frac{18}{19}\)
\(=\frac{1}{7}\times\frac{75}{19}-\frac{1}{7}\times\frac{18}{19}\)
\(=\frac{1}{7}\times\left(\frac{75}{19}-\frac{18}{19}\right)\)
\(=\frac{1}{7}\times3\)
\(=\frac{3}{7}\)
theo mình nghĩ là
( 112 x 115 ) x ( 113 x 114 ) x 116
sai thì cho xin lỗi nha bn
\(\frac{13}{21}+3+\frac{29}{21}\)
\(=\frac{42}{21}+3\)
\(=2+3\)
\(=5\)
\(\frac{3}{4}+\frac{3}{5}+\frac{2}{8}+\frac{4}{10}\)
\(=\frac{3}{4}+\frac{3}{5}+\frac{1}{4}+\frac{2}{5}\)
\(=1+1\)
\(=2\)
21/29
= 21/29 x (2/7 + 5/7)
= 21/29 x 1
= 21/29