tinh :
4 phan 7* 5 phan 6 +5 phan 7 *5 phan 6 ; 1 phan 2 :3 * 1 phan 2
tinh :
4 phan 7* 5 phan 6+ 5 phan 7 * 5 phan 6 ; 1 phan 2 chia 3 * 1 phan 2
\(\frac{4}{7}x\frac{5}{6}+\frac{5}{7}x\frac{5}{6}\)
\(=\frac{5}{6}x\left(\frac{4}{7}+\frac{5}{7}\right)=\frac{5}{6}x\frac{9}{7}=\frac{45}{42}=\frac{15}{14}\)
\(\frac{1}{2}:3x\frac{1}{2}=\frac{1}{6}x\frac{1}{2}=\frac{1}{12}\)
tinh
2 - 5 phan 6
7 phan 8 + 3 phan 4
2 phan 5 + 3 phan 4
7 phan 12 - 2 phan 7 + 1 phan 12
12 phan 17 - 5 phan 17 - 4 phan 17
2 - 5/6= 7/6
7/8+3/4=`13/8
2/5+3/4=23/20
7/12 - 2/7 + 1/12=8/21
12/17 - 5/17 - 4/17=3/17
\(2-\frac{5}{6}=1\frac{1}{6}\)
\(\frac{7}{8}+\frac{3}{4}=1\frac{5}{8}\)
\(\frac{2}{5}+\frac{3}{4}=\frac{23}{20}\)
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=\frac{8}{7}\)
\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}=\frac{3}{17}\)
tinh nhanh 4 phan 5 cong 2 phan 7 cong 11 phan 5 cong 12 phan 7 cong 1 phan 5
\(\frac{4}{5}+\frac{2}{7}+\frac{11}{5}+\frac{12}{7}+\frac{1}{5}\)
\(=\frac{4}{5}+\frac{11}{5}+\frac{1}{5}+\frac{2}{7}+\frac{12}{7}\)
\(=\frac{4+11+1}{5}+\frac{2+12}{7}\)
\(=\frac{16}{5}+\frac{14}{7}\)
\(=\frac{16}{5}+2=\frac{26}{5}\)
\(\frac{4}{5}+\frac{2}{7}+\frac{11}{5}+\frac{12}{7}+\frac{1}{5}\)
\(=\left(\frac{4}{5}+\frac{11}{5}+\frac{1}{5}\right)+\left(\frac{2}{7}+\frac{12}{7}\right)\)
\(=\frac{16}{5}+\frac{14}{7}\)
\(=\frac{16}{5}+2=\frac{16}{5}+\frac{10}{5}=\frac{26}{5}\)
\(\frac{4}{5}+\frac{2}{7}+\frac{11}{5}+\frac{12}{7}+\frac{1}{5}\)
\(=\left(\frac{4}{5}+\frac{11}{5}+\frac{1}{5}\right)+\left(\frac{2}{7}+\frac{12}{7}\right)\)
\(=\frac{16}{5}+2\)
\(=\frac{26}{5}\)
So sách hai phân số.
a.1 phần 3 và 1 phần 4 ; 3 phần 5 và 5 phần 6.
b.3 phần 10 và 8 phần 5 ; 4 phan 3 va 7 phan 6.
c.7 phan 4 va 1 phan 6 ; 5 phan 6 va 7 phan 8
Tính tổng có quy luật sau
A 6 và 2 phần 7+ 7 va 3 Phan 5 8 va 1 Phan 4+ 5 phan 7 + 1 phan 3+ 3 phan 4+1967
tinh
7 phan 12 - 2 phan 7 + 1 phan 12
12 phan 12 - 5 phan 17 - 4 phan 17
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}\)=\(\frac{25}{84}\)+\(\frac{1}{12}\)=\(\frac{8}{21}\)
\(\frac{12}{12}-\frac{5}{17}-\frac{4}{17}=\frac{12}{17}-\frac{4}{17}=\frac{8}{17}\)
quy dong mau so cac phan so
5 phan 3 va4 phan 7=
4 phan 3;1 phan 2 va 3 phan 5=
3 phan 4va9 phan 16=
5 phan 6;7 phan 8;13 phan24=
11 phan9 va 13 phan 6=
tinh bang cach thuan tien
a, 12 phan 25 + 3 phan 5 + 13 phan 25
b, 3 phan 2 + 2 phan 3 + 4 phan 3
c, 3 phan 5 + 7 phan 5 + 3 phan 4
a, \(\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)
\(=\left(\frac{12}{25}+\frac{13}{25}\right)+\frac{3}{5}\)
\(=1+\frac{3}{5}\)
\(=\frac{8}{5}\)
b, \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}\)
\(=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)\)
\(=\frac{3}{2}+2\)
\(=\frac{7}{2}\)
c, \(\frac{3}{5}+\frac{7}{5}+\frac{3}{4}\)
\(=2+\frac{3}{4}\)
\(=\frac{11}{4}\)
nhớ ấn đúng giùm tớ nha
a) = 8 phần 5
b) = 7 phần 2
c) = 11 phần 4
nhớ ấn giùm tớ nha
quy dong cac phan so sau a, 1 phan 3 va 5 phan 6 b,7 phan 9 va 1 phan 6 c, 12 phan 15 va 2 phan 5
1/3 và 5/6 =2/6+5/6= 7/6
7/9 và 1/6 =7/3+1/3 =8/3
12/15 và 2/5=12/15 +6/15=18/15
k nhoa !!!!!!!