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a, 7. ( -28 ) = ( -49 ) . 4
\(\Rightarrow\frac{7}{-49}=\frac{4}{-28}\)
\(\Rightarrow\frac{-28}{4}=-\frac{49}{7}\)
b, 0,36 . 4,25 = 0,9 . 1,7
\(\frac{0,36}{0,9}=\frac{1,7}{4,25}\)
\(\Rightarrow\frac{0,9}{0,36}=\frac{4,25}{1,7}\)
\(7\cdot\left(-28\right)=\left(-49\right)\cdot4\)
từ đó ta suy ra được các tỉ lệ thức sau :
\(\frac{7}{-49}=\frac{4}{-28}\)
\(\frac{-49}{7}=\frac{-28}{4}\)
\(\frac{4}{7}=\frac{-28}{-49}\)
\(\frac{7}{4}=\frac{-49}{-28}\)
\(1.\)
\(a,\)
\(7.\left(-28\right)=\left(-49\right).4\)
Ta có : \(\frac{7}{-49}=\frac{4}{-28}\) \(\frac{-28}{4}=\frac{-49}{7}\)
\(\frac{7}{4}=\frac{-49}{-28}\) \(\frac{-28}{-49}=\frac{4}{7}\)
\(b,\)
\(0,36.4,25=0,9.1,7\)
Ta có : \(\frac{0,36}{0,9}=\frac{1,7}{4,25}\) \(\frac{0,36}{1,7}=\frac{0,9}{4,25}\)
\(\frac{4,25}{0,9}=\frac{1,7}{0,36}\) \(\frac{4,25}{1,7}=\frac{0,9}{0,36}\)
a: 7/-49=4/-28
7/4=-49/-28
-49/7=-28/4
4/7=-28/-49
b: -3/4=-15/20
-3/-15=4/20
4/-3=20/-15
-15/-3=20/4
c: -2/-9=-6/-27
-2/-6=-9/-27
-9/-2=-27/-6
-6/-2=-27/-9
a: \(\dfrac{1.12}{2.8}=\dfrac{-4}{-10};\dfrac{1.12}{-4}=\dfrac{2.8}{-10};\dfrac{2.8}{1.12}=\dfrac{-10}{-4};\dfrac{-4}{1.12}=\dfrac{-10}{2.8}\)
b: \(\dfrac{0.16}{0.4}=\dfrac{0.32}{0.8};\dfrac{0.16}{0.32}=\dfrac{0.4}{0.8};\dfrac{0.4}{0.16}=\dfrac{0.8}{0.32};\dfrac{0.32}{0.16}=\dfrac{0.8}{0.4}\)
(-0,3).15,39 = -4,617
2,7.(-1,71) = -4,617
=> (-0,3).15,39 = 2,7.(-1,71)
Vậy ta có tỉ lệ thức (-0,3): 2,7 = (-1,71) : 15,39
a: 0,36/0,9=1,7/4,25
0,36/1,7=0,9/4,25
0,9/0,36=4,25/1,7
1,7/0,36=4,25/0,9
b: \(\dfrac{-0.8}{0.16}=\dfrac{20}{-4};\dfrac{-0.8}{20}=\dfrac{0.16}{-4};\dfrac{0.16}{-0.8}=\dfrac{-4}{20};\dfrac{20}{-0.8}=\dfrac{-4}{0.16}\)
c: \(\dfrac{-0.3}{-1.71}=\dfrac{2.7}{15.39};\dfrac{-0.3}{2.7}=\dfrac{-1.71}{15.39}\)
\(\dfrac{-1.71}{-0.3}=\dfrac{15.39}{2.7};\dfrac{2.7}{-0.3}=\dfrac{15.39}{-1.71}\)