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((25.9 - 25.17))(( - 8.80 - 8.10)) ) và ((48.12 - 48.15))(( - 3.270 - 3.30)) ). hãy so sánh 2 phân số trên
a)2.3.5.13/26.35
=2.3.5.13/2.13.5.7
=3/7
b)18.6-18/-36.(-35)
=18.6-18/-(36.25)=18(6-1)/-(36.35)
=18.5/-(36.35)=2.3.3.5/-(2.2.3.3.5.7)
=-1/14
c)6.4+6.7/6.5+12=6.4+6.7/6.5+6.2
=6(4+7)/6(5+2)
=11/10
d)25.9-25.17/-8.80-8.10=25(9-17)/8(-80-10)
=25.(-8)/8(-90)
=5/18
e) 34.5-36/34.13-34
=34(5-32)/34(13-1)
=5-32/13-1=-1/3
\(\frac{25\cdot9-25\cdot17}{-8\cdot80-8\cdot10}=\frac{25\cdot(9-17)}{8\cdot(-80)-8\cdot10}=\frac{25\cdot(-8)}{8\cdot(-80-10)}=\frac{25\cdot(-8)}{8\cdot(-90)}=\frac{5}{18}\)
P/S : Hoq chắc :>
\(\frac{25.9-25.17}{-8.80-8.10}\)= \(\frac{25\left(9-17\right)}{-8\left(80+10\right)}\)= \(\frac{25.\left(-8\right)}{90.\left(-8\right)}\)= \(\frac{25}{90}\)= \(\frac{5}{18}\)
\(\dfrac{25.9-25.17}{-8.80-8.10}=\dfrac{-200}{-720}=\dfrac{5}{18}\)
\(\dfrac{48.12-48.15}{-3.270-3.30}=\dfrac{-144}{-900}=\dfrac{4}{25}\)
a, Quy đồng
\(\dfrac{5}{18}=\dfrac{5\times25}{18\times25}=\dfrac{125}{450}\)
\(\dfrac{4}{25}=\dfrac{4.18}{25.18}=\dfrac{72}{450}\)
Ta có :
\(\frac{25.9-15.17}{\left(-8\right).80-8.10}=\frac{5^2.3^2-3.5.17}{\left(-8\right).\left(80+10\right)}=\frac{3.5.\left(3.5-17\right)}{\left(-8\right).90}=\frac{15.\left(-2\right)}{\left(-8\right).90}=\frac{-30}{\left(-8\right).90}=\frac{1}{8.3}=\frac{1}{24}\)
\(-8 .80 - 8 . 10 \)
\(=\)\(-8 . ( 80 - 10 )\)
\(=\)\(-8 . 70\)
\(=\)\(-560\)
a ) \(\frac{-360}{450}\)
TA có : \(\frac{-360}{450}=\frac{-4}{5}\)
b ) \(\frac{-260}{1500}\)
Ta có : \(\frac{-260}{1500}\)= \(\frac{-13}{75}\)
a) \(\frac{25.9-25.17}{-8.80-8.10}=\frac{25.\left(9-17\right)}{-8.\left(80+10\right)}=\frac{25.\left(-8\right)}{-8.90}=\frac{5}{18}\)
b) \(\frac{48.12-48.15}{-3.270-3.30}=\frac{48.\left(12-15\right)}{-3.\left(270+30\right)}=\frac{48.\left(-3\right)}{-3.300}=\frac{4}{25}\)
c) \(\frac{2^5.7+2^5}{2^5.5^2-2^5.3}=\frac{2^5.\left(7+1\right)}{2^5.\left(5^2-3\right)}=\frac{2^5.8}{2^5.\left(25-3\right)}=\frac{2^5.8}{2^5.22}=\frac{4}{11}\)
d) \(\frac{3^4.5-3^6}{3^4.13+3^4}=\frac{3^4.\left(5-3^2\right)}{3^4.\left(13+1\right)}=\frac{3^4.\left(5-9\right)}{3^4.14}=\frac{3^4.\left(-4\right)}{3^4.14}=\frac{-2}{7}\)
lấy máy tính ra bấm là nó ra liền à
\(\frac{-35}{280}=\frac{\left(-35\right):35}{280:35}=\frac{-1}{8}\)
\(\frac{24}{72}=\frac{24:24}{72:24}=\frac{1}{3}\)
\(\frac{15}{-105}=\frac{-15}{105}=\frac{\left(-15\right):15}{105:15}=\frac{-1}{7}\)
\(\frac{36}{240}=\frac{36:12}{240:12}=\frac{3}{20}\)
\(\frac{125}{1000}=\frac{125:125}{1000:125}=\frac{1}{8}\)
\(\frac{198}{126}=\frac{198:18}{126:18}=\frac{11}{7}\)