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Giải :
0,8 x 120 + 4 x 2 x 6 +8 x 2 +8 x 80
= 8 x 12 + 8 x 6 + 8 x 2 + 8 x 80
= 8 x ( 12 + 6 + 2 + 80 )
= 8 x 100
= 800
= 800 nha bạn
hok tốt
bạn nào trên 10 sp hoặc 10 sp k giúp mình ạ
\(\left(-3,2\right).\left(\frac{-15}{64}\right)+\left(0,8-2\frac{4}{15}\right):3\frac{1}{2}\)
đúng đề bài này ko
\(\left(-3,2\right).\left(\frac{-15}{64}\right)+\left(0,8-2\frac{4}{15}\right):3\frac{1}{2}\)
\(=\frac{-16}{5}.\left(\frac{-15}{64}\right)+\left(\frac{4}{5}-\frac{34}{15}\right):\frac{7}{2}\)
\(=\frac{3}{4}+\left(\frac{-22}{15}\right):\frac{7}{2}\)
\(=\frac{3}{4}-\frac{44}{105}\)
\(=\frac{139}{420}\)
a: =0,945
\(\simeq0.95\)
b: \(\simeq2,98\)
c: =-20,4
d: =2,6-6,3-9,4=-13,1
80 − (4 . 52 – 3 . 23)
= 80 – ( 4 . 25 – 3 . 8)
= 80 – (100 – 24 )
= 80 – 76 = 4
80 – [130 – (12 - 4)2] = 80 – [130 – 82]
= 80 – [130 - 64] = 80 - 66 = 14
\(80-\left[130-\left(12-4\right)^2\right]=80-\left[130-8^2\right]=80-\left[130-64\right]=80-66=14\)
=\(\left[\dfrac{\left(0,4.2\right)^5}{\left(0,4\right)^6}+\dfrac{2^9.2^6.3^8}{\left(3.2\right)^6.2^9}\right]=\left[\dfrac{\left(0,4\right)^5.2^5}{\left(0,4\right)^6}+\dfrac{2^6.3^8}{3^6.2^6}\right]\)
=\(\left[\dfrac{2^5}{0,4}+3^2\right]\)
=\(\left[80+9\right]=89\)
\(\left[\dfrac{\left(2.0,4\right)^5}{0,4,0,4^5}+\dfrac{2^{15}.3^8}{3^6.2^6.2^9}\right]\div\dfrac{3^{20}.5^{30}}{3^{15}.5^{30}}\)
\(=\left[\dfrac{2^5.0.4^5}{0,4.0,4^5}+\dfrac{2^{15}.3^8}{3^6.2^{15}}\right]\div3^5\)
\(=\left[\dfrac{2^5}{0,4}+3^2\right]\div243\)
\(=80+\left(3^5\div3^2\right)\)
\(=80+3^3\)
\(=80+27\)
\(=107\)
Answer:
\(\dfrac{4}{-5}.2,7-0,8.6,3-80\%\)
\(=\dfrac{-4}{5}.\dfrac{27}{10}-\dfrac{4}{5}.\dfrac{63}{10}-\dfrac{4}{5}\)
\(=\dfrac{4}{5}.\dfrac{-27}{10}-\dfrac{4}{5}.\dfrac{63}{10}-\dfrac{4}{5}.1\)
\(=\dfrac{4}{5}.\left(\dfrac{-27}{10}-\dfrac{63}{10}-\dfrac{10}{10}\right)\)
\(=\dfrac{4}{5}.\dfrac{-27-63-10}{10}\)
\(=\dfrac{4}{5}.\dfrac{-100}{10}\)
\(=\dfrac{4}{5}.\left(-10\right)\)
\(=\dfrac{4}{1}.\dfrac{-2}{1}\)
\(=-8\)