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\(a)\frac{a}{b}\times4+\frac{1}{6}=\frac{17}{6}\)
\(\frac{a}{b}\times4\) \(=\frac{17}{6}-\frac{1}{6}\)
\(\frac{a}{b}\times4\) \(=\frac{8}{3}\)( Đây là kết quả khi rút gọn phân số 16/6 nha )
\(\frac{a}{b}\) \(=\frac{8}{3}\div4\)
\(\frac{a}{b}\) \(=\frac{8}{3}\times\frac{1}{4}\)
\(\frac{a}{b}\) \(=\frac{2}{3}\)
\(b)\frac{4}{5}\div\frac{a}{b}\times2=\frac{16}{5}\)
\(\frac{4}{5}\div\frac{a}{b}\) \(=\frac{16}{5}\div2\)
\(\frac{4}{5}\div\frac{a}{b}\) \(=\frac{16}{5}\times\frac{1}{2}\)
\(\frac{4}{5}\div\frac{a}{b}\) \(=\frac{8}{5}\)
\(\frac{a}{b}\) \(=\frac{4}{5}\div\frac{8}{5}\)
\(\frac{a}{b}\) \(=\frac{4}{5}\times\frac{5}{8}\)
\(\frac{a}{b}\) \(=\frac{1}{2}\)
Nếu có gì ko hiểu bạn cứ hỏi mik nha.
\(a,\left(\frac{6}{11}+\frac{5}{11}\right)\times\frac{3}{7}\)
Cách 1: \(\left(\frac{6}{11}+\frac{5}{11}\right)\times\frac{3}{7}=1\times\frac{3}{7}=\frac{10}{7}\)
Cách 2: \(\left(\frac{6}{11}+\frac{5}{11}\right)\times\frac{3}{7}=\frac{6}{11}\times\frac{3}{7}+\frac{5}{11}\times\frac{3}{7}=\frac{18}{77}+\frac{15}{77}=\frac{33}{77}=\frac{3}{7}\)
\(b,\frac{3}{5}\times\frac{7}{9}+\frac{3}{5}\times\frac{2}{9}\)
Cách 1: \(\frac{3}{5}\times\frac{7}{9}+\frac{3}{5}\times\frac{2}{9}=\frac{7}{15}+\frac{2}{15}=\frac{9}{15}\)
Cách 2: \(\frac{3}{5}\times\frac{7}{9}+\frac{3}{5}\times\frac{2}{9}=\frac{3}{5}\times1=\frac{3}{5}\)
P/s: Ý B có vấn đề thì phải
\(a,\left(\frac{6}{11}+\frac{5}{11}\right)x\frac{3}{7}\)
\(=\frac{11}{11}=1x\frac{3}{7}\)
\(=\frac{3}{7}\)
cach 2
\(\frac{6}{11}x\frac{3}{7}+\frac{5}{11}x\frac{3}{7}\)
\(=\frac{18}{77}+\frac{15}{77}\)
\(=\frac{33}{77}=\frac{3}{7}\)
\(b,\frac{3}{5}x\frac{7}{9}+\frac{3}{5}x\frac{2}{9}\)
\(=\frac{21}{45}+\frac{6}{45}\)
\(=\frac{27}{45}=\frac{3}{5}\)
cách 2 :
\(\frac{3}{5}x\left(\frac{7}{9}+\frac{2}{9}\right)\)
\(=\frac{3}{5}x\frac{9}{9}\)
\(=\frac{27}{45}=\frac{3}{5}\)
Trl :
a) X x 6 + X x 4 = 5970
X x ( 6 + 4 ) = 5970
X x 10 = 5970
X = 5970 : 10
X = 597
b) 2 x X + 7 x X = 9009
X x ( 2 + 7 ) = 9009
X x 9 = 9009
X = 9009 : 9
X = 1001
a.
x + 4/5 = 4/5 + 36/35
x + 4/5 = 64/35
x = 64/35 - 4/5
x = ......
b.
5/7 + x/35 = 4/5
Ta có :
25/35 + x/35 = 28/35
Suy ra x = 28 - 25
x = 3
a) \(\left(\frac{5}{12}+\frac{1}{4}\right)\cdot\frac{6}{4}=\left(\frac{5}{12}+\frac{3}{12}\right)\cdot\frac{3}{2}=\frac{8}{12}\cdot\frac{3}{2}\)\(=\frac{24}{24}=1\)
b) \(\left(\frac{5}{3}-\frac{7}{6}\right):\frac{2}{5}=\left(\frac{10}{6}-\frac{7}{6}\right):\frac{2}{5}=\frac{3}{6}:\frac{2}{5}\)\(=\frac{1}{2}:\frac{2}{5}=\frac{5}{4}\)
a.(5/12+1/4)+6/4
=(5/12+3/12)+6/4
=8/12+6/4
=8/12+18/12
=20/12
=5/3
b.(5/3-7/6):2/5
=(30/18-21/18):2/5
=9/18:2/5
=1/2:2/5
=1/2*5/2
=5/4
a) \(x\times\frac{9}{13}=\frac{5}{6}\)
\(x=\frac{5}{6}:\frac{9}{13}\)
\(x=\frac{65}{54}\)
b) \(\frac{7}{9}+\frac{5}{x}=\frac{73}{36}\)
\(\frac{5}{x}=\frac{73}{36}-\frac{7}{9}\)
\(\frac{5}{x}=\frac{5}{4}\)
\(x=5:\frac{5}{4}\)
\(x=4\)
1)A=aaa xb =ax1111xb =axbbbb =B
2) (1+4+7+.....+100):x =17
( (100+1)x34:2):x =17
=> 101x17:x =17
=>17x x=101x x
=> x =101
Trl :
a) 6 x 48 + 6 x 52
= 6 x ( 48 + 52 )
= 6 x 100
= 600
b) 268 x 7 + 268 x 3
= 268 x ( 7 + 3 )
= 268 x 10
= 2680
a) 6 x 48 + 6 x 52
= 6 x ( 48 + 52 )
= 6 x 100
= 600
b) 268 x 7 + 268 x 3
= 268 x ( 7 + 3 )
= 268 x 10
= 2 680
*HỌC TỐT*