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\(\frac{\left(\frac{3}{15}+\frac{1}{4}+\frac{7}{20}\right)\times\frac{17}{49}}{5\frac{1}{3}+\frac{2}{5}}=\frac{\left(\frac{1}{5}+\frac{1}{4}+\frac{7}{20}\right)\times\frac{17}{49}}{\frac{16}{3}+\frac{2}{5}}\)
=\(\frac{\left(\frac{4}{20}+\frac{5}{20}+\frac{7}{20}\right)\times\frac{17}{49}}{\frac{80}{15}+\frac{6}{15}}=\frac{\frac{16}{20}\times\frac{17}{49}}{\frac{86}{15}}=\frac{\frac{4}{5}\times\frac{17}{49}}{\frac{86}{15}}\)
=\(\frac{68}{245}\times\frac{15}{86}=\frac{102}{2107}\)
\(\frac{\left(\frac{3}{15}+\frac{1}{4}+\frac{7}{20}\right)\times\frac{17}{49}}{5\frac{1}{3}+\frac{2}{5}}\)
\(=\frac{\left(\frac{12}{60}+\frac{15}{60}+\frac{21}{60}\right)\times\frac{17}{49}}{\frac{16}{3}\times\frac{2}{5}}\)
\(=\frac{\frac{48}{60}\times\frac{17}{49}}{\frac{80}{15}+\frac{6}{15}}\)
\(=\frac{\frac{816}{2940}}{\frac{86}{15}}\)
\(=\frac{816}{2940}:\frac{86}{15}\)
\(=\frac{816}{2940}\times\frac{15}{86}\)
\(=\frac{68}{245}\times\frac{15}{86}\)
\(=\frac{102}{2107}\)
\(\frac{\frac{4}{17}-\frac{4}{49}-\frac{4}{131}}{\frac{3}{17}-\frac{3}{49}-\frac{3}{131}}=\frac{4\left(\frac{1}{17}-\frac{1}{49}-\frac{1}{131}\right)}{3\left(\frac{1}{17}-\frac{1}{19}-\frac{1}{131}\right)}=\frac{4}{3}\)
\(\frac{1}{5}+\frac{4}{10}+...+\frac{81}{45}=\frac{1}{5}+\frac{2}{5}+\frac{3}{5}+...+\frac{9}{5}=\frac{1+2+3+...+9}{5}=\frac{45}{5}=9\)
1/5 + 4/10 + 9/15 + 16/20 + 25/25 + 36/30 + 49/35 + 64/40 + 81/45
=1/5 + 2/5 + 3/5 + 4/5 + 5/5 + 6/5 + 7/5 + 8/5 + 9/5
=45/5 = 9
a) 5/30+15/90+25/150+35/210+45/270
=1/6+1/6+1/6+1/6+1/6
=1/6 x 5
=5/6
b) 1/2+1/6+1/12+1/20+....+1/56
=1/1x2+1/2x3+1/3x4+1/4x5+.....1/7x8
=1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.......-1/7+1/7-1/8
=1/1-1/8
=7/8
c) mình chịu
\(\frac{\left(\frac{3}{20}+\frac{1}{2}-\frac{1}{5}\right).\frac{12}{49}}{3\frac{1}{3}+\frac{2}{9}}=\frac{\left(\frac{3}{20}+\frac{1}{2}-\frac{1}{5}\right).\frac{12}{49}}{\frac{10}{3}+\frac{2}{9}}=\frac{\left(\frac{13}{20}-\frac{1}{5}\right).\frac{12}{49}}{\frac{32}{9}}=\frac{\frac{9}{20}.\frac{12}{49}}{\frac{32}{9}}=\frac{\frac{27}{245}}{\frac{32}{9}}=\frac{243}{7840}\)
Có đúng không vu bao quynh?
đề bài là:(3/20+1/2-1/5)-12/49 phần 10/3 dổi từ3mot phan ba +2/9 đúng ko
\(\left(\frac{3}{20}+\frac{1}{2}-\frac{1}{5}\right)-\frac{12}{49}=\left(\frac{3}{20}+\frac{10}{20}-\frac{4}{20}\right)-\frac{12}{49}=\frac{9}{20}-\frac{12}{49}=\frac{201}{980}\)
\(3\frac{1}{3}+\frac{2}{9}=\frac{10}{3}+\frac{2}{9}=\frac{30}{9}+\frac{2}{9}=\frac{32}{9}\)
tick đúng cho mk nha tran Thi Thanh Hong 01
