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a) -15/90=-5/30=1/6
120/600=12/60=4/20=1/5
-75/150=-15/30=-5/10=-1/2
b)54/-90=6/-10=3/-5
-180/288=-90/144=-10/16=-5/8
60/-135=20/-45=4/-9
a) Rút gọn:
\(\dfrac{-1}{6};\dfrac{1}{5};\dfrac{-1}{2}\)
Quy đồng:
\(\dfrac{-5}{30};\dfrac{6}{30};\dfrac{-15}{30}\)
b) Rút gọn:
\(\dfrac{-3}{5};\dfrac{-5}{8};\dfrac{-4}{9}\)
Quy đồng:
\(\dfrac{-216}{360};\dfrac{-225}{360};\dfrac{-160}{360}\)
c 212121/353535
=212121:21/353535:35
=10101/10101
=212121:10101/353535:10101
=21/35
a. \(-\frac{15}{90}=-\frac{1}{6};\frac{120}{600}=\frac{1}{5};-\frac{75}{150}=-\frac{1}{2}\)
Mẫu chung: 30
\(-\frac{1}{6}=-\frac{5}{30};\frac{1}{5}=\frac{6}{30};-\frac{1}{2}=-\frac{15}{30}\)
b. \(\frac{54}{-90}=\frac{3}{-5}=-\frac{3}{5};-\frac{180}{288}=-\frac{5}{8};\frac{60}{-135}=\frac{4}{-9}=-\frac{4}{9}\)
Mẫu chung: 360
\(-\frac{3}{5}=-\frac{216}{360};-\frac{5}{8}=-\frac{225}{360};-\frac{4}{9}=-\frac{160}{360}\).
Trả lời
Bài 1:
-5/80;7/16;-9/20
-5/80=-5/80
7/16=35/80
-9/20=-36/80
Bài 2:
-54/90=-6/10=-3/5=-216/360
-180/288=-20/32=-5/8=-225/360
60/-135=-12/27=-4/9=160/380
\(\dfrac{15}{90}\) = \(\dfrac{1}{6}\) = \(\dfrac{1.5}{6.5}\) = \(\dfrac{5}{30}\)
\(\dfrac{120}{600}\) = \(\dfrac{1}{5}\) = \(\dfrac{1.6}{5.6}\) = \(\dfrac{6}{30}\)
\(\dfrac{75}{150}\) = \(\dfrac{1}{2}\) = \(\dfrac{1.15}{2.15}\) = \(\dfrac{15}{30}\)
Ta có:
\(\dfrac{15}{90}=\dfrac{1}{6};\dfrac{120}{600}=\dfrac{1}{5};\dfrac{75}{150}=\dfrac{1}{2}\)
\(\Rightarrow MSC\) là: \(60\)
\(\dfrac{1}{6}=\dfrac{1.10}{6.10}=\dfrac{10}{60}\)
\(\dfrac{1}{5}=\dfrac{1.12}{5.12}=\dfrac{12}{60}\)
\(\dfrac{1}{2}=\dfrac{1.30}{2.30}=\dfrac{30}{60}\)
