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| Thừa số | 3,18 | 8,07 | 2,389 |
| Thừa số | 3 | 5 | 10 |
| Tích | 9,54 | 40,35 | 23,89 |
TL :
\(\text{0,256 x 8 = 2,048}\)
\(\text{6,8 x 15 = 102}\)
HT
0,256 x 8=2,048
6,8 x 15 = 102
~HT~
2,5 x 7 = 17,5
4,18 x 5 = 20,9
0,52 x 1000 + 12,5 = 532,5
Tick mình
\(419:\left(8\times8\times4,18+0,17\times2,5+2,09\times2\times36+0,23\times2,5\right)\)
\(=419:\left(64\times4,18+0,17\times2,5+4,18\times36+0,23\times2,5\right)\)
\(=419:\left[\left(64+36\right)\times4,18+\left(0,17+0,23\right)\times2,5\right]\)
\(=419:\left[100\times4,18+0,4\times2,5\right]\)
\(=419:\left[418+1\right]\)
\(=419:419\)
\(=1\)
\(=\dfrac{419}{64\cdot4.18+0,17\cdot2,5+2,09\cdot72+0,23\cdot2,5}\)
\(=\dfrac{419}{0,4\cdot2,5+64\cdot4,18+2,09\cdot72}\)
\(=\dfrac{419}{1+418}=1\)
a) 7,63 x 12,47 + 12,47 x 2,37 - 2,5 x 40
= 12,47 x (7,63 + 2,37) - 100
= 12,43 x 10 - 100
= 124,3 - 100
= 24,3
b) \(\dfrac{7.5.12}{15.8.4}\) = \(\dfrac{7.5.3.2.2}{3.5.2.2.2.2.2}\) = \(\dfrac{7}{4.2}\)= \(\dfrac{7}{8}\)
(P/s: Dấu "." là dấu x (nhân) đó nha! :>>>)
Chúc bạn học tốt!! ^^
\(a.32,5-3\cdot0,87=32,5-2,61=29,89\)
\(8,5\cdot\left(1\dfrac{1}{2}+\dfrac{4}{4}\right):5=8,5\cdot\left(\dfrac{3}{2}+\dfrac{4}{4}\right):5\\ =8,5\cdot\left(\dfrac{6}{4}+\dfrac{4}{4}\right):5\\ =8,5\cdot\dfrac{10}{4}:5\\ =\dfrac{85}{4}:5\\ =\dfrac{17}{4}\)
\(b.30,96-6,45+14,4:3=30,96-6,45+4,8\\ =29,31\)
\(\dfrac{2}{5}\cdot\left(\dfrac{4}{5}-\dfrac{1}{2}\right)=\dfrac{2}{5}\cdot\left(\dfrac{8}{10}-\dfrac{5}{10}\right)\\ =\dfrac{2}{5}\cdot\dfrac{3}{10}=\dfrac{3}{25}\)
bài 2
\(a.2,5\cdot12,5\cdot8\cdot0,4=\left(2,5\cdot0,4\right)\left(12,5\cdot8\right)\\ =1\cdot100=100\)
b,\(\dfrac{12}{15}\cdot\dfrac{5}{6}\cdot\dfrac{3}{20}\cdot\dfrac{32}{5}=\dfrac{12\cdot5\cdot3\cdot32}{15\cdot6\cdot20\cdot5}\\ =\dfrac{3\cdot4\cdot5\cdot3\cdot4\cdot8}{3\cdot5\cdot2\cdot3\cdot5\cdot4\cdot5}=\dfrac{16}{25}\)
Bài 1:
a) \(32.5-3\cdot0.87=32.5-2.61=29.89\)
\(8.5\cdot\left(1\dfrac{1}{2}+\dfrac{4}{4}\right):5=8.5\cdot\dfrac{5}{2}:5=\dfrac{17}{2}\cdot\dfrac{5}{2}:5=\dfrac{85}{4}\cdot\dfrac{1}{5}=\dfrac{17}{4}\)
17,5
20,9
2,048
102
9,54
40,35
23,89
170,4
2,5 x 7 = 17,5
4,18 x 5 = 20,9
0,256 x 8 = 2,048
6,8 x 15 = 102
3,18 x 3 = 9,54
8,07 x 5 = 40,35
2,389 x 10 = 23,89
42,6 x 4 = 170,4