25.9-25.17/-8.80-8.10
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\(\dfrac{25.9-25.17}{-8.80-8.10}=\dfrac{-200}{-720}=\dfrac{5}{18}\)
\(\dfrac{48.12-48.15}{-3.270-3.30}=\dfrac{-144}{-900}=\dfrac{4}{25}\)
a, Quy đồng
\(\dfrac{5}{18}=\dfrac{5\times25}{18\times25}=\dfrac{125}{450}\)
\(\dfrac{4}{25}=\dfrac{4.18}{25.18}=\dfrac{72}{450}\)
25.9-25.17/-8.80-.10=25.(9-17)/-8(80+10)=25.(-8)/-8.90=25/90=5/18
48.12-48.15/-3.270-3.30=48.(12-15)/-3(270+30)=48.-3/-3.300=48/300=4/25
thông cảm e mới học lớp 6 nên sai thì thôi còn chỗ -3 hay -8 là vì thay -2 lần trừ ra cộng
((25.9 - 25.17))(( - 8.80 - 8.10)) ) và ((48.12 - 48.15))(( - 3.270 - 3.30)) ). hãy so sánh 2 phân số trên
\(\frac{-35}{280}=\frac{\left(-35\right):35}{280:35}=\frac{-1}{8}\)
\(\frac{24}{72}=\frac{24:24}{72:24}=\frac{1}{3}\)
\(\frac{15}{-105}=\frac{-15}{105}=\frac{\left(-15\right):15}{105:15}=\frac{-1}{7}\)
\(\frac{36}{240}=\frac{36:12}{240:12}=\frac{3}{20}\)
\(\frac{125}{1000}=\frac{125:125}{1000:125}=\frac{1}{8}\)
\(\frac{198}{126}=\frac{198:18}{126:18}=\frac{11}{7}\)
\(\frac{25.9-25.17}{-8.80-8.10}=\frac{25\left(9-17\right)}{-8\left(80+10\right)}=\frac{25.\left(-8\right)}{\left(-8\right).90}=\frac{25}{90}=\frac{5}{18}\)
\(\dfrac{25.9-25.17}{-8.80-8.10}=\dfrac{25.\left(9-17\right)}{-8.\left(80+10\right)}=\dfrac{25.\left(-8\right)}{-8.90}=\dfrac{25}{90}=\dfrac{5}{18}\)
\(\dfrac{48.12-48.15}{-3.270-3.30}=\dfrac{48.\left(12-15\right)}{-3.\left(270+30\right)}=\dfrac{48.\left(-3\right)}{-3.300}=\dfrac{48}{300}=\dfrac{4}{25}\)
MC = 450
\(\dfrac{5}{18}=\dfrac{5.25}{18.25}=\dfrac{125}{450}\)
\(\dfrac{4}{25}=\dfrac{4.18}{25.18}=\dfrac{72}{450}\)
25.9−25.17−8.80−8.10=25.(9−17)−8.(80+10)=25.(−8)−8.90=2590=51825.9−25.17−8.80−8.10=25.(9−17)−8.(80+10)=25.(−8)−8.90=2590=518
48.12−48.15−3.270−3.30=48.(12−15)−3.(270+30)=48.(−3)−3.300=48300=42548.12−48.15−3.270−3.30=48.(12−15)−3.(270+30)=48.(−3)−3.300=48300=425
MC = 450
518=5.2518.25=125450518=5.2518.25=125450
Ta có :
\(\frac{25.9-15.17}{\left(-8\right).80-8.10}=\frac{5^2.3^2-3.5.17}{\left(-8\right).\left(80+10\right)}=\frac{3.5.\left(3.5-17\right)}{\left(-8\right).90}=\frac{15.\left(-2\right)}{\left(-8\right).90}=\frac{-30}{\left(-8\right).90}=\frac{1}{8.3}=\frac{1}{24}\)
\(-8 .80 - 8 . 10 \)
\(=\)\(-8 . ( 80 - 10 )\)
\(=\)\(-8 . 70\)
\(=\)\(-560\)
\(\frac{25\cdot9-25\cdot17}{-8\cdot80-8\cdot10}=\frac{25\cdot(9-17)}{8\cdot(-80)-8\cdot10}=\frac{25\cdot(-8)}{8\cdot(-80-10)}=\frac{25\cdot(-8)}{8\cdot(-90)}=\frac{5}{18}\)
P/S : Hoq chắc :>
\(\frac{25.9-25.17}{-8.80-8.10}\)= \(\frac{25\left(9-17\right)}{-8\left(80+10\right)}\)= \(\frac{25.\left(-8\right)}{90.\left(-8\right)}\)= \(\frac{25}{90}\)= \(\frac{5}{18}\)