Hỗn số 2 và 5/7 +3/14 -6/7 +0.5+9/14
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a) x+30%x=-1.31
=> 100%x+30%x=-1.31
=>x.(100%+30%)=-1.31
=>x.13/10=-1.31=-1.31:13/10=-131/130
b) (x-1/2):1/3+5/7=9+5/7
=>(x-1/2).3+5/7=68/7
=>(x-1/2).3=68/7-5/7=9
=>x-1/2=9:3=3
=>x=3+1/2=3 1/2( hỗn số)
c) 1/2x-3/4=14/9.3/7
=>1/2x-3/4=2/3
=>1/2x=2/3+3/4=17/12
x=17/12:1/2=17/12.2=17/6
d) - 5/6 -x = 7/12+ -1/3
=>- 5/6 -x = 7/12+ -4/12=1/4
=> x = -5/6 -1/4=-13/12
e) x + 3/-15 = 1/3
=> x= 1/3 - -3/15 =1/3+3/15
=> x=5/15 + 3/15=8/15
f) (4,5 -2 x). (-1 4/7)=11/14
=> 4,5 -2x=11/14 : -3/7=11/14. -7/3=-11/6
=>-2x=-11/6-9/2= -11/6 -27/6 =-19/3
=>x= -19/3: -2x=19/6
Chúc bn thi HKII tốt!!!
3: \(=\dfrac{13}{5}\left(-\dfrac{3}{14}+\dfrac{2}{5}+\dfrac{-11}{14}+\dfrac{3}{5}\right)\)
=0
a) \(\dfrac{5}{9}< \dfrac{7}{9}\)
b) \(\dfrac{7}{6}>\dfrac{6}{6}\)
c) \(\dfrac{3}{14}< \dfrac{5}{14}\)
d) \(\dfrac{5}{8}< \dfrac{9}{8}\)
Các hỗn só và phân số = nhau là:5/3=1 12/18; 5 9/31=1 29/65; 55/14=5 13/44; 94/65=164/31;2 7/13=66/26
a: -3/5=-27/45
-7/9=-35/45
b: -5/21=-230/966
-9/14=-621/966
-6/-46=3/23=252/966
a: -3/5 = -27/45 -7/9 = -35/45
b: -5/21 = -230/966 -9/14 = -621/966 -6/-46 = 252/966
2\(\dfrac{5}{7}\) + \(\dfrac{3}{14}\) - \(\dfrac{6}{7}\) + 0,5 + \(\dfrac{9}{14}\)
= 2 + \(\dfrac{5}{7}\) + (\(\dfrac{3}{14}\) + \(\dfrac{9}{14}\)) - \(\dfrac{6}{7}\) + 0,5
= ( 2 + \(\dfrac{1}{2}\)) + ( \(\dfrac{5}{7}\) - \(\dfrac{6}{7}\) ) + \(\dfrac{12}{14}\)
= \(\dfrac{5}{2}\) - \(\dfrac{1}{7}\) + \(\dfrac{6}{7}\)
= \(\dfrac{5}{2}\)+ \(\dfrac{5}{7}\)
= \(\dfrac{35}{14}\) + \(\dfrac{10}{14}\)
= \(\dfrac{45}{14}\)