Rút gọn phân số \(\frac{2130-15}{3550-25}\)
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rút gọn
\(\frac{2130-15}{3550-25}\)
\(\frac{2130-15}{3550-25}=\frac{2115}{3525}=\frac{3}{5}\)
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Rút gọn
2130-15/(-3550)+20
\(\frac{2130-15}{\left(-3550\right)+20}=\frac{2115}{-3520}=-\frac{423}{704}\)
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rút gọn
\(\frac{23.5-23}{4-27}\);
\(\frac{2130-15}{3550-25}\);
\(\frac{1717-101}{2828-404}\)
Bài 1 Rút gọn
a)2.5.23/46.12
b)23.5-23/4-27
c)2130-15/3550-25
d)1717-101/2828+404
e)4116-14/1029-35
f)2929-101/2.1919+404
a.9/27+7/-49 b.-12/10+-25/30 c.-20/35+-16/-24 d.-21/77+10/-35 e.36/-84+100/450 g.2/7+1/3+-2/-5 h.1/5+-14/-20+6/21 k.23.5-23 /4-27+2130-15/3550-25+2.13/23 .Rút gọn trước và sau khi xong
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a; \(\dfrac{9}{27}\) + \(\dfrac{7}{-49}\)
= \(\dfrac{1}{3}\) - \(\dfrac{1}{7}\)
= \(\dfrac{7}{21}\) - \(\dfrac{3}{21}\)
= \(\dfrac{4}{21}\)
b; - \(\dfrac{12}{10}\) + \(\dfrac{-25}{30}\)
= - \(\dfrac{6}{5}\) - \(\dfrac{5}{6}\)
= -\(\dfrac{36}{30}\) - \(\dfrac{25}{30}\)
= \(\dfrac{-61}{30}\)
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c; \(\dfrac{-20}{35}\) + \(\dfrac{-16}{-24}\)
= - \(\dfrac{4}{7}\) + \(\dfrac{2}{3}\)
= - \(\dfrac{12}{21}\) + \(\dfrac{14}{21}\)
= \(\dfrac{2}{21}\)
d; - \(\dfrac{21}{77}\) + \(\dfrac{10}{-35}\)
= - \(\dfrac{3}{11}\) - \(\dfrac{2}{7}\)
= - \(\dfrac{21}{77}\) - \(\dfrac{22}{77}\)
= - \(\dfrac{43}{77}\)
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Rút gọn các phân số sau:a) frac{2.7.13}{26.35} b) frac{23.5-23}{4-27} c) frac{2130-15}{3550-25} d, frac{1717-101}{2828+404} e) frac{3.5.11.13}{33.35.27} f) frac{85-17+34}{51-102}
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Rút gọn các phân số sau:
a) \(\frac{2.7.13}{26.35}\) b) \(\frac{23.5-23}{4-27}\) c) \(\frac{2130-15}{3550-25}\)
d, \(\frac{1717-101}{2828+404}\) e) \(\frac{3.5.11.13}{33.35.27}\) f) \(\frac{85-17+34}{51-102}\)
a) \(\frac{2.7.13}{26.35}=\frac{2.7.13}{2.13.5.7}=\frac{1}{5}\)
b) \(\frac{23.5-23}{4-27}=\frac{23.\left(5-1\right)}{-23}=\frac{23.4}{-23}=\frac{23.\left(-4\right)}{23}=-4\)
c) \(\frac{2130-15}{3550-25}=\frac{142.15-15}{142.25-25}=\frac{15.\left(142-1\right)}{25.\left(142-1\right)}=\frac{15.141}{25.141}=\frac{15}{25}=\frac{3.5}{5.5}=\frac{3}{5}\)
d) \(\frac{1717-101}{2828+404}=\frac{17.101-101}{28.101+101.4}=\frac{101.\left(17-1\right)}{101.\left(28+4\right)}=\frac{101.16}{101.32}=\frac{16}{32}=\frac{4.4}{2.4.4}=\frac{1}{2}\)
e) \(\frac{3.5.11.13}{33.35.27}=\frac{3.5.11.13}{3.11.5.7.3^3}=\frac{13}{7.3^3}=\frac{13}{189}\)
f) \(\frac{85-17+34}{51-102}=\frac{5.17-17+2.17}{3.17-6.17}=\frac{17.\left(5-1+2\right)}{17.\left(3-6\right)}=\frac{17.6}{17.\left(-3\right)}=\frac{6}{-3}=-2\)
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Tính rồi rút gọn:a)
2
5
+
3
6
b)
21
30
-
9
30
c)
5
8
×
4
7
d)
7
9
÷
11
6
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Tính rồi rút gọn:
a) 2 5 + 3 6 =
b) 21 30 - 9 30 =
c) 5 8 × 4 7 =
d) 7 9 ÷ 11 6 =
a) 2 5 + 3 6 = 12 30 + 15 30 = 27 30 = 9 10
b) 21 30 - 9 30 = 12 30 = 2 5
c) 5 8 × 4 7 = 20 56 = 5 14
d) 7 9 ÷ 11 6 = 7 9 × 6 11 = 42 99 = 14 33
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rút gọn phân số:999+8543-518/904-638+2130=?
Ai nhanh nhất mk tk nha
RÚT GỌN PHÂN SỐ SAU: \(\frac{-63}{108};\frac{-33}{-77};\frac{-5}{10};\frac{14}{63};\frac{-15}{25};\frac{-45}{18};\frac{12}{15};\frac{20}{25};\frac{31}{12}\)
\(\frac{-63}{108}\)= \(\frac{-7}{12}\)
\(\frac{-33}{-77}\)= \(\frac{3}{7}\)
\(\frac{-5}{10}\)=\(\frac{-1}{2}\)
\(\frac{14}{63}\)=\(\frac{2}{9}\)
\(\frac{-15}{25}\)=\(\frac{-3}{5}\)
\(\frac{-45}{18}\)=\(\frac{-5}{2}\)
\(\frac{12}{15}\)=\(\frac{4}{5}\)
\(\frac{20}{25}\)=\(\frac{4}{5}\)
\(\frac{31}{12}\):Là phân số tối giản
t.i.c.k nha
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