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NHƯ NÀY NÈ:
\(\frac{36}{6}\cdot\frac{36}{7}=\frac{36\cdot36}{6\cdot7}=\frac{36\cdot6\cdot6}{6\cdot7}=\frac{36\cdot6}{7}=\frac{216}{7}=30\frac{6}{7}\)
MK KHÔNG BIẾT CÓ ĐÚNG KO.
K MK NHA. (NẾU ĐÚNG ^_^)
a)2,5*16,27*4=(2,5*4)*16,27=10*16,27=162,7.
b)0,25*1,25*4*8=(0,25*4)*(1,25*8)=1*10=10.
d)3/4*4/5+5/6*6/7*7/8=3*4/4*5+5*6*7/6*7*8=3/5+5/8=49/40.
a) 2,5 x 16,27 x 4
= (2,5 x 4) x 16,27
= 10 x 16,27
= 162,7
b) 0,25 x 1,25 x 4 x 8
= (0,25 x 4) x (1,25 x 8)
= 1 x 10
= 10
c) 6,7 x 9,55 + 9,45 x 16,7 + 16,7
= 6,7 x 9,55 + (9,45 + 1) x 16,7
= 6,7 x 9,55 + 10,45 x 16,7
= 63,985 + 174,515
= 238,5
d) 3/4 x 4/5 + 5/6 x 6/7 x 7/8
= 3/4 x 4/5 + 5/6 x 3/4
= 3/4 x (4/5 + 5/6)
= 3/4 x 49/30
= 49/40
Gọi \(A=\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{22.25}\)
\(\Leftrightarrow\)\(3A=\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+...+\frac{3}{22.25}\)
\(\Leftrightarrow\)\(3A=\frac{1}{1}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{22}-\frac{1}{25}\)
\(\Leftrightarrow\)\(3A=1-\frac{1}{25}\)
\(\Leftrightarrow\)\(3A=\frac{24}{25}\)
\(\Leftrightarrow\)\(A=\frac{24}{25}:3\)
\(\Leftrightarrow\)\(A=\frac{24}{25}.\frac{1}{3}\)
\(\Leftrightarrow\)\(A=\frac{8}{25}\)
Vậy \(A=\frac{8}{25}\)
Đặt \(C=\frac{1}{1.4}+\frac{1}{4.7}+...+\frac{1}{22.25}\)
\(\Rightarrow3C=\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+....+\frac{3}{22.25}\)
\(\Rightarrow3C=1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{22}-\frac{1}{25}\)
\(\Rightarrow3C=1-\frac{1}{25}=\frac{24}{25}\)
\(\Rightarrow C=\frac{24}{25}:3=\frac{8}{25}\)
Vậy \(\frac{1}{1.4}+\frac{1}{4.7}+...+\frac{1}{22.25}=\frac{8}{24}\)
27/8 - 7/3 + 4/3 - 2
= 27/8 - (7/3 - 4/3) - 2
= 27/8 - 1 - 2
=27/8 - 3
= 3/8
\(\frac{1}{8}\times58,35+0,125\times41+12,5\%\times0,65\)
\(=0,125\times58,35+0,125\times41+0,125\times0,65\)
\(=0,125\times\left(58,35+41+0,65\right)\)
\(=0,125\times100\)
\(=12,5\)
\(\frac{1}{8}\)x 58,35 + 0,125 x 41 + 12,5% x 0,65
= \(\frac{1}{8}\)x 58,35 + \(\frac{1}{8}\)x 41 + \(\frac{1}{8}\)x 0,65
= \(\frac{1}{8}\)x ( 58,35 + 41 + 0,65 )
= \(\frac{1}{8}\)x 100
= 12,5
68-27 phần41
tích mk nha bạn
\(\frac{68\cdot35-27}{34\cdot68+41}\)
\(=\frac{68\left(34+1\right)-27}{34\cdot68+41}\)
\(=\frac{68\cdot34+68-27}{34\cdot68+41}\)
\(=\frac{1+41}{1+41}\)
\(=1\)