Tính nhanh:
(\(\frac{5}{12}\)+1\(\frac{4}{3}\)-0,25):\(\frac{5}{8}\)+0,75
giúp mình nha
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\(\frac{3}{2}+\frac{3}{8}+\frac{3}{32}+\frac{3}{128}+\frac{3}{512}\)
=\(\frac{3}{1.2}+\frac{3}{2.4}+\frac{3}{4.8}+\frac{3}{8.16}+\frac{3}{16.32}\)
=\(\frac{3}{1}-\frac{3}{2}+\frac{3}{2}-\frac{3}{4}+\frac{3}{4}-\frac{3}{8}+\frac{3}{8}-\frac{3}{16}+\frac{3}{16}-\frac{3}{36}\)
=\(\frac{3}{1}-\frac{3}{36}\)=\(\frac{35}{12}\)
Chú ý : 1 và 4/3 = 1 + 4/3 = 7/3
( 5/12 + 1+4/3 - 0 ,25 ) : 5/8 - 75%
= ( 5/12 + 7/3 - 1/4 ) . 8/5 - 3/4
= ( 5/12 + 28/12 - 3/12 ) . 8/5 - 3/4
= 30/12 . 8/5 - 3/4
= 4 - 3/4
= 16/4 - 3/4
= 13/4
=(5/12+7/3-1/4):5/8-3/4
=(5/12+28/12-1/4):5/8-3/4
=(33/12-1/4):5/8-3/4
=(33/12-3/12):5/8-3/4
=30/12:5/8-3/4
=5/2:5/8-3/4
=5/2x8/5-3/4
=4-3/4
=4/1-3/4
=16/4-3/4
=13/4
A= 7/8:(4/18-1/18)+7/8:(1/36-15/36)
=7/8:1/6+7/8:(-7/18)
=7/8:(1/6+-7/18)=7/8:(3/18+-7/18)=7/8:(-2/9)=-63/18=-7/2
\(\frac{\frac{3}{8}-\frac{3}{10}+\frac{3}{11}+\frac{3}{12}}{\frac{5}{8}-\frac{5}{10}+\frac{5}{11}+\frac{5}{12}}+\frac{\frac{3}{2}+1+\frac{3}{4}}{\frac{5}{2}+\frac{5}{3}+\frac{5}{4}}\)
\(=\frac{3.\left(\frac{1}{8}-\frac{1}{10}+\frac{1}{11}+\frac{1}{12}\right)}{5.\left(\frac{1}{8}-\frac{1}{10}+\frac{1}{11}+\frac{1}{12}\right)}+\frac{3.\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\right)}{5.\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\right)}\)
\(=\frac{3}{5}+\frac{3}{5}\)
\(=\frac{6}{5}\)
Đặt \(A=\left(\frac{5}{12}+1\frac{4}{3}-0,25\right):\frac{5}{8}+0,75\)
\(A=\left(\frac{5}{12}+\frac{7}{3}-\frac{1}{4}\right):\frac{5}{8}+0,75\)
\(A=\left(\frac{5}{12}+\frac{28}{12}-\frac{3}{12}\right):\frac{5}{8}+\frac{15}{32}:\frac{5}{8}\)
\(A=\frac{5}{2}:\frac{5}{8}+\frac{15}{32}:\frac{5}{8}\)
\(A=\left(\frac{5}{2}+\frac{15}{32}\right):\frac{5}{8}\)
\(A=\frac{19}{4}\)
CÓ PHẢI = 63/20 ĐÚNG KO
NẾU ĐÚNG THÌ K HOẶC KB NHÉ! ! !