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bài 1 : Tính
2048 : 23 = 2048 : 8 = 256
bài 1.1 : Tính
625 : 52 . 40 = 625 : 25 . 40 = 25 . 40 = 1000
a; - \(\dfrac{2}{3}\) + \(\dfrac{3}{4}\) - (- \(\dfrac{1}{6}\)) + (- \(\dfrac{2}{5}\))
= - \(\dfrac{2}{3}\) + \(\dfrac{3}{4}\) + \(\dfrac{1}{6}\) - \(\dfrac{2}{5}\)
= \(-\dfrac{40}{60}\) + \(\dfrac{45}{60}\) + \(\dfrac{10}{60}\) - \(\dfrac{24}{60}\)
= \(\dfrac{5}{60}\) + \(\dfrac{10}{60}\) - \(\dfrac{24}{60}\)
= \(\dfrac{15}{60}\) - \(\dfrac{24}{60}\)
= - \(\dfrac{3}{20}\)
b; (- \(\dfrac{2}{3}\)) + (- \(\dfrac{1}{5}\)) + \(\dfrac{3}{4}\) - \(\dfrac{5}{6}\) - \(\dfrac{-7}{10}\)
= - \(\dfrac{2}{3}\) - \(\dfrac{1}{5}\) + \(\dfrac{3}{4}\) - \(\dfrac{5}{6}\) + \(\dfrac{7}{10}\)
= - \(\dfrac{40}{60}\) - \(\dfrac{12}{60}\) + \(\dfrac{45}{60}\) - \(\dfrac{50}{60}\) + \(\dfrac{42}{60}\)
= - \(\dfrac{52}{60}\) + \(\dfrac{45}{60}\) - \(\dfrac{50}{60}\) + \(\dfrac{42}{60}\)
= - \(\dfrac{7}{60}\) - \(\dfrac{50}{60}\) + \(\dfrac{42}{60}\)
= - \(\dfrac{57}{60}\) + \(\dfrac{42}{60}\)
= - \(\dfrac{1}{4}\)
a.2.3/5:2.1/4+5/2
=2.3.4/5.2.1+5/2
=3.4/5+5.2
=12/5+5/2=24/10+25/10=49/10
b.16/6-2.1/6:1.1/7
=16/6-2/6.1/7
=16/6-2/42
=55/21
a)2×3/5÷2×1/4+5/2
=6/5÷1/2+5/2
=12/5+5/2
=49/10
b)16/6-2×1/6÷1×1/7
=8/3-1/3÷1/7
=8/3-7/3
=1/3
\(\frac{1}{2}.\frac{1}{2}+\frac{1}{2}.\frac{1}{3}\)\(+\frac{1}{3}.\frac{1}{4}+\frac{1}{4}.\frac{1}{5}+\frac{1}{5}.\frac{1}{6}\)
\(=\frac{1}{4}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}\)
\(=\frac{1}{4}+\left(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\right)\)
\(=\frac{1}{4}+\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\right)\)
\(=\frac{1}{4}+\left(\frac{1}{2}-\frac{1}{6}\right)\)
\(=\frac{1}{4}+\frac{1}{3}\)
\(=\frac{7}{12}\)
rút gọn biểu thức
B=4^2.25^2+32.125/2^3.5^2
C=3^2.1/243.81^2.1/3^2
D=4^6.256^2.2^4
Các pạn giúp mình na
a) 3.10^3 + 2.10^2 + 5.10
= 3. 1 000 + 2. 100 + 5. 10
= 3 000 + 200 + 50
= 3 200 + 50
= 3 250
b) 35 – 2.1^111 + 3.7.7^2
= 35 – 2. 1 + 21. 49
= 35 – 2 + 1 029
= 33 + 1 029
= 1 062
c) 5.4^3 + 2.3 – 81.2 + 7
= 5. 64 + 6 – 162 + 7
= 320 + 6 – 162 + 7
= 326 – 162 + 7
= 164 + 7
= 171
35 - 2.1+ 3.7.7
= 35 - 2+ 147
=33 + 147
=180.
cảm ơn bạn