30.8 - 6.25 × 14.4 : 3
=
=
=
9^7.2^3-3^14.4/3^17-3^15.5
\(\frac{9^7.2^3-3^{14}.4}{3^{17}-3^{15}.5}\)
\(=\frac{\left(3^2\right)^7.2^3-3^{14}.2^2}{3^{15}.\left(3^2-5\right)}\)
\(=\frac{3^{14}.2^3-3^{14}.2^2}{3^{15}.\left(9-5\right)}\)
\(=\frac{3^{14}.2^2.\left(2-1\right)}{3^{15}.2^2}\)
\(=\frac{1}{3}\)
3 / 6.25
Tính
9.6:0.2x15.4x2x15.4:0.25/30.8:0.5x7.7:0.125x5x1.6
\(\dfrac{5^6.25^3}{25}\)
\(\dfrac{5^6.25^3}{25}=\dfrac{5^6.5^6}{5^2}=5^{6+6-2}=5^{10}\)
\(\dfrac{5^6.25^3}{25}=\dfrac{5^6.\left(5^2\right)^3}{5^2}=\dfrac{5^6.5^6}{5^2}=\dfrac{5^{12}}{5^2}=5^{12-2}=5^{10}\)
\(\dfrac{5^6.25^3}{25}\)\(=5^6.25^2=9765625\)
2.4*3+1.8*4+1.2*6+3.6*2+14.4+7.2*4
(29.38-3.25*5+36.36/3)/6.25
( 29,38 - 3,25 x 5 +36,36 : 3 ) : 6,25
= 25,25 : 6,25
= 4,04
[29.38-3.25*5+36.36:3]:6.25
(29.38-3.25*5+36.36/3)/6.25
Tính nhanh
M=23.45×14-68.54×6.25+1.55×17-0.54×6.25