tinh
B=3+3x6^2+6^2/13
tinh nhanh
6^3+3x6^2+3^3/-13
63+3x6233/-13
Tìm giá trị của các biểu thức sau:
a) 2 mũ 7 x 9 mũ 3/6 mũ 5 x 8 mũ 2
d)6 mũ 3+3x6 mũ 2+3 mũ 3/-13
a)
= \(\dfrac{128.9^3}{65.8^2}\)
= \(\dfrac{128.729}{7776.64}\)
=\(\dfrac{93312}{497664}\)
= \(\dfrac{1}{3}\)
a)\(\dfrac{\left(0,6\right)^5}{\left(0,2\right)^6}\)
b)\(\left(1+\dfrac{2}{3}-\dfrac{1}{4}\right)x\left(\dfrac{4}{5}-\dfrac{3}{4}\right)\)
c)\(2:\left(\dfrac{1}{2}-\dfrac{2}{3}\right)^2\)
d)\(\dfrac{6^3+3x6^2+3^3}{-13}\)
a) \(\dfrac{\left(0,6\right)^5}{\left(0,2\right)^6}=\dfrac{\left(0,2.3\right)^5}{\left(0,2\right)^5.\left(0,2\right)}=\dfrac{\left(0,2\right)^5.3^5}{\left(0,2\right)^5.\left(0,2\right)}=\dfrac{3^5}{0,2}=\dfrac{243}{0,2}=1215\)
c) \(2:\left(\dfrac{1}{2}-\dfrac{2}{3}\right)^2=2:\left(\dfrac{3}{6}-\dfrac{4}{6}\right)^2=2:\left(-\dfrac{1}{6}\right)^2=2:\dfrac{1}{36}=72\)
Tính giá trị biểu thức sau:
2/1x3+3/3x6+4/6x10+5/10x15+6/15x21
\(\frac{2}{1.3}+\frac{3}{3.6}+\frac{4}{6.10}+\frac{5}{10.15}+\frac{6}{15.21}\)
= \(1-\frac{1}{3}+\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{10}+\frac{1}{10}-\frac{1}{15}+\frac{1}{15}-\frac{1}{21}\)
= \(1-\frac{1}{21}\)
= \(\frac{20}{21}\)
Ủng hộ mk nha !!! ^_^
tinhB=1+2+22+23+....+22016/1-22017
1+8+5-2+4-4+2-3x6=...........
6+7x2:2+12x8-7= ................
Tính)
a) 5+3x52/-8
b)103+5x102+53/63+3x62+33
\(b,\frac{10^3+5x10^2+5^3}{6^3+3x6^2+3^3}\)
\(=\frac{5\left(200+10^2+5^2\right)}{3\left(72+6^2+3^2\right)}\)
\(=\frac{5\left(200+100+25\right)}{3\left(72+36+9\right)}\)
\(=\frac{5.325}{3.117}\)
\(=\frac{125}{27}\)
mot nguoi di xe may tu tin a den tinhb mat 3 gio gio thu nhat di duoc 2/5 gio gio thu 2 di duoc 1/3 gio gio thu 3 di dupc 44km tinh trung binh 1 gio di dfuoc bao nhieu km
cac ban oi tra loi nhanh ho minh voi