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\(\dfrac{1111\times5}{1515\times7}=\dfrac{1111\times5}{303\times5\times7}=\dfrac{1111}{2121}\)
\(=\dfrac{11\times101}{21\times101}=\dfrac{11}{21}\)
32x50 / 48x75=1600/3600=4/9
63x81 /135x75=5103/10125=63/125
1111x5x1515x7=58 910 775
duyệt mình đi các bạn !
\(\frac{222222}{323232}=\frac{222222:20202}{323232:20202}=\frac{11}{16}\)
\(\frac{121212}{484848}=\frac{121212:121212}{484848:121212}=\frac{1}{4}\)
\(\frac{5555}{7575}=\frac{5555:505}{7575:505}=\frac{11}{15}\)
\(\frac{1111}{5656}=\frac{1111:101}{5656:101}=\frac{11}{56}\)
\(\frac{1919}{4141}=\frac{1919:101}{4141:101}=\frac{19}{41}\)
\(\frac{1515}{4545}=\frac{1515:1515}{4545:1515}=\frac{1}{3}\)
\(\frac{1515}{3636}=\frac{1515:303}{3636:303}=\frac{5}{12}\)
a. \(\left(\dfrac{17}{2}+\dfrac{1}{2}+1\right).\dfrac{4}{7}\)
\(=\dfrac{19}{2}.\dfrac{4}{7}=\dfrac{38}{7}\)
b. \(\dfrac{2727}{2323}.\dfrac{69}{54}\)
\(=\dfrac{27}{23}.\dfrac{23.3}{27.2}=\dfrac{3}{2}\)
2. Chiều cao hình bình hành là: 1200 : 60 = 20 cm
a, \(\dfrac{17}{2}\) \(\times\) \(\dfrac{4}{7}\) + \(\dfrac{4}{7}\) \(\times\) \(\dfrac{1}{2}\) + \(\dfrac{4}{7}\) b, \(\dfrac{1515}{2323}\) \(\times\) \(\dfrac{69}{54}\) \(\times\) \(\dfrac{2727}{1515}\)
= \(\dfrac{17}{2}\) \(\times\) \(\dfrac{4}{7}\) + \(\dfrac{4}{7}\) \(\times\) \(\dfrac{1}{2}\) + \(\dfrac{4}{7}\) \(\times\) 1 = \(\dfrac{15}{23}\) \(\times\) \(\dfrac{23}{18}\) \(\times\) \(\dfrac{27}{15}\)
= \(\dfrac{4}{7}\) \(\times\) ( \(\dfrac{17}{2}\) + \(\dfrac{1}{2}\) + 1) = \(\dfrac{27}{18}\)
= \(\dfrac{4}{7}\) \(\times\) ( 9 + 1) = \(\dfrac{3}{2}\)
= \(\dfrac{4}{7}\times10\)
= \(\dfrac{40}{7}\)
Bài 2: Chiều cao của hình bình hành là:
1200 : 60 = 20 cm
Đổi 20 cm = 2 dm
Đáp số: 2 dm
Giải chi tiết
Rùi ticks cho❤❤♫☺♬♪✿
1111x 5 = 5555
1515 x7 = 10605