Rút gọn :
a) \(\dfrac{3.5}{8.24}\)
b) \(\dfrac{2.14}{7.8}\)
c) \(\dfrac{3.7.11}{22.9}\)
d) \(\dfrac{8.5-8.2}{16}\)
e) \(\dfrac{11.4-11}{2-13}\)
rút gọn các phân số sau:
a,\(\dfrac{8.5-8.2}{16}\)
b,\(\dfrac{2.14}{7.8}\)
c\(\dfrac{11.4-11}{2-13}\)
d,\(\dfrac{17.5-17}{3-20}\)
e,\(\dfrac{49+7.49}{49}\)
a. \(\dfrac{8,5-8,2}{16}=\dfrac{0,3}{16}=\dfrac{3}{160}\)
b. \(\dfrac{2\cdot14}{7\cdot8}=\dfrac{1\cdot2}{1\cdot4}=\dfrac{2}{4}=\dfrac{1}{2}\)
c. \(\dfrac{11\cdot4-11}{2-13}=\dfrac{11\left(4-1\right)}{-11}=\dfrac{1\cdot3}{-1}=-3\)
d. \(\dfrac{49+7\cdot49}{49}=\dfrac{49\cdot\left(1+7\right)}{49}=\dfrac{8}{1}=8\)
Rút gọn:
a) 3.5/8.24 b)2.14/7.8 c) 3.7.11/22.9
d)8 .5- 8 .2/ 16 e)11.4-11/2-13
Rút gọn:
a) 3.5/8.24 b)2.14/7.8 c) 3.7.11/22.9
d)8 .5- 8 .2/ 16 e)11.4-11/2-13
( Các bạn giúp mình nhé...ghi rõ cả cách làm)
\(\frac{3.5}{8.24}=\frac{3.5}{2^3.2^3.3}=\frac{1.5}{8.8.1}=\frac{5}{64}\)
\(\frac{2.14}{7.8}=\frac{2.7.2}{7.2^3}=\frac{1.7}{7.2}=\frac{1}{2}\)
\(\frac{3.7.11}{22.9}=\frac{1.7.11}{11.2.3}=\frac{1.7.1}{1.2.3}=\frac{7}{6}\)
\(\frac{8.5-8.2}{16}=\frac{8\left(5-2\right)}{8.2}=\frac{8.3}{8.2}=\frac{1.3}{1.2}=\frac{3}{2}\)
\(\frac{11.4-11}{2-13}=\frac{11\left(4-1\right)}{-11}=\frac{11.3}{-11}=-3\)
Bài 17 (Sgk Toán 6 Trang 15)
a) 3.5/8.24=3.5:3/8.24:3=5/8.8=5/64.
b) 2.14/7.8=2.2.7/7.2^3=2.7/7.4=1/2.
c) 3.7.11/22.9=3.7.1/12.11.3^2=7/2.3=76.
d) 8.5−8.2/16=(8.5−8.2):8/16:8=5−2/2=32.
e) 11.4−11/2−13=11.4−11/−11=(11.4−11):11/−11:11=4−1/−1=−3/1=-3
Rút gọn:
a) \frac{3900-15}{3120-12}=3120−123900−15=
b) \frac{1620+12}{2025+15}=2025+151620+12=
Rút gọn các phân số sau: -63/72, 20/-140, 3.10/5.24, 3.7.11/22.9, 8.5-8.2/16, 11.4-11/2-13 Giúp mik với
\(\dfrac{-63}{72}=\dfrac{-7}{8}\)
\(\dfrac{20}{-140}=\dfrac{-1}{7}\)
\(\dfrac{3.10}{5.24}=\dfrac{30}{120}=\dfrac{1}{4}\)
\(\dfrac{3.7.11}{22.9}=\dfrac{231}{198}=\dfrac{7}{6}\)
\(\dfrac{8.5-8.2}{16}=\dfrac{24}{16}=\dfrac{3}{2}\)
\(\dfrac{11.4-11}{2-13}=\dfrac{33}{-11}=-3\)
\(\dfrac{8.5-8.2}{16}\) \(\dfrac{11.4-11}{2-13}\)
bài 4 ý mn giúp mình nhe !
Ta có: \(\dfrac{8.5-8.2}{16}=\dfrac{8\left(5-2\right)}{16}=\dfrac{8.3}{16}=\dfrac{3}{2}\)
\(\dfrac{11.4-11}{2-13}=\dfrac{11\left(4-1\right)}{-11}=\dfrac{11.3}{-11}=-3\)
Câu 10: (0,5đ) Kết quả khi rút gọn \(\dfrac{8.5-8.2}{16}\) là:
A. \(\dfrac{5-16}{2}=\dfrac{11}{2}\) B.\(\dfrac{40-2}{2}=\dfrac{38}{2}=19\)
C.\(\dfrac{40-16}{16}=40\) D.\(\dfrac{8.\left(5-2\right)}{16}=\dfrac{3}{2}\)
11.Kết quả của phép trừ \(\dfrac{1}{27}-\dfrac{1}{9}\) là
A.=\(\dfrac{0}{18}\) B.=\(\dfrac{1-3}{27}=\dfrac{-2}{27}\)
C.\(\dfrac{2}{27}\) D.=\(\dfrac{5}{4}\)
rút gọn các phân số sau:
a) \(\dfrac{22}{55}=\) b) \(\dfrac{-63}{81}=\)
c)\(\dfrac{2.14}{7.8}=\) d)\(\dfrac{49+7.49}{49}=\)
a) \(\dfrac{22}{55}=\dfrac{2}{5}\)
b) \(\dfrac{-63}{81}=\dfrac{-7}{9}\)
c) \(\dfrac{2.14}{7.8}=\dfrac{2.7.2}{7.2.2.2}=\dfrac{1}{2}\)
d) \(\dfrac{49+7.49}{49}=\dfrac{49.\left(7+1\right)}{49}=\dfrac{49.8}{49}=8\)
\(\dfrac{22}{55}=\dfrac{2}{5}\) \(\dfrac{-63}{81}=\dfrac{-7}{9}\)
\(\dfrac{2.14}{7.8}=\dfrac{28}{56}=\dfrac{1}{2}\) \(\dfrac{49+7.49}{49}=8\)
rút gọn các phân số sau:
a,\(\dfrac{8.5-8.2}{16}\)
b,\(\dfrac{17.5-17}{3-20}\)
a) \(\dfrac{8,5-8,2}{16}=\dfrac{0,3}{16}=\dfrac{0,3\cdot10}{16\cdot10}=\dfrac{3}{160}\)
b) \(\dfrac{17\cdot5-17}{3-20}=\dfrac{17\cdot\left(5-1\right)}{-17}=\dfrac{1\cdot4}{-1}=-4\)
a)
\(\dfrac{8\cdot5-8\cdot2}{16}=\dfrac{8\left(5-2\right)}{16}=\dfrac{3}{2}\)
b)
\(\dfrac{17\cdot5-17}{3-20}=\dfrac{17\left(5-1\right)}{-17}=\dfrac{4}{-1}=-4\)
rút gọn phân số : \(\dfrac{3.5}{8.24}\)
\(\dfrac{3.5}{8.24}=\dfrac{3.5}{8.3.8}=\dfrac{5}{64}\)
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