\(\frac{7}{12}\):\(\frac{3}{8}\)
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d, 2 . 17 . 12 + 4 . 6 . 12 + 8 . 3 . 62
= 2 . 12 . 17 + 24 . 12 + 24 . 62
= 24 . 17 + 24 . 12 + 24 . 62
= 24 . ( 17 + 12 + 62 )
= 24 . 91
= 2184
\(\left(\frac{1}{10}-1\right).\left(\frac{1}{11}-1\right).....\left(\frac{1}{100}-1\right)\)
\(=\frac{-9}{10}.\frac{-10}{11}......\frac{-99}{100}\)
\(=\frac{-9}{100}\)
a) =-5/7 +7/8-2/7+1/8- -1/12+ -13/12
=(-5/7-2/7)+(7/8+1/8)-(-1/12--13/12)
=-7/7+8/8 - 12/12
= -1+1+1
=1
b)= ( -3/8+11/8)-(12/11+ -1/11)+(-3/5- 2/5)
= 1- 1 + (-1)
=-1
\(\dfrac{18}{3}=18:3=6\)
\(\dfrac{45}{9}=45:9=5\)
\(\dfrac{8}{8}=8:8=1\)
\(\dfrac{7}{1}=7:1=7\)
a) 2/7+-3/8+11/7+1/3+1/7+5/-8
=(2/7+11/7+1/7)+(3/8+-5/8)+1/3
=2+2+1/3
=4+1/3
=13/3
b) -3/8+12/25+5/-8+2/-5+13/25
=(-3/8+-5/8)+(12/25+13/25)+-2/5
=-1+1+-2/5
=0+-2/5
=-2/5
c)7/8+1/8*3/8+1/8*5/8
=7/8+1/8*(3/8+5/8)
=7/8+1/8*1
=7/8+1/8
=1
a) 2/7+-3/8+11/7+1/3+1/7+5/-8
=(2/7+11/7+1/7)+(3/8+-5/8)+1/3
=2+2+1/3
=4+1/3
=13/3
b) -3/8+12/25+5/-8+2/-5+13/25
=(-3/8+-5/8)+(12/25+13/25)+-2/5
=-1+1+-2/5
=0+-2/5
=-2/5
c)7/8+1/8*3/8+1/8*5/8
=7/8+1/8*(3/8+5/8)
=7/8+1/8*1
=7/8+1/8
=1
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
\(\frac{7}{12}:\frac{3}{8}=\frac{7}{12}\cdot\frac{8}{3}=\frac{14}{9}\)
\(\frac{7}{12}\div\frac{3}{8}=\frac{7}{12}\times\frac{8}{3}=\frac{56}{36}=\frac{14}{9}\)
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