tính: \(\frac{49.3^3-15^2.7+7.81}{3.15^2-10^3}\)
1/Tính họp lí(nếu có thể):
a, \(5-\frac{1}{3}-1\frac{2}{3}+\frac{1}{2}\)\
b,\(\frac{3}{2}.\frac{4}{9}-\frac{1}{5}-\frac{2}{15}\)
c,\(\frac{25^{21}.7^{30}}{5^{40}.49^{15}.10}\)
d,\(\frac{3^{18}.25^5}{15^{10}.27^3}\)
Giup vs mk pải nộp gấp
Tính
a) ( \(\frac{-2}{3}\)+\(\frac{4}{15}\))3
b) (\(\frac{3}{21}\)- \(\frac{2}{7}\))2
d) 3 - (-3.15)0 + (0.5)2 :2
e) 81 - 32 : (0.375)2
Thanks <3
\(\frac{15^3-3.15^2-3^3}{11.3^4}\)
\(\frac{8^5.16^3}{4^{13}}-\frac{3^{33}.4^{15}}{6^{32}}\)
Tính nhanh: \(\left(\frac{1}{49}-\frac{1}{2^2}\right)\times\left(\frac{1}{49}-\frac{1}{3^2}\right)\times...\times\left(\frac{1}{49}-\frac{1}{40^2}\right)\)
Tính Nhanh:\(\frac{\left(\frac{1}{10}-\frac{\sqrt{2}}{7}+\frac{3\sqrt{2}}{35}\right).\left(-\frac{4}{15}\right)}{\left(\frac{1}{10}+\frac{3\sqrt{2}}{25}-\frac{\sqrt{2}}{5}\right).\frac{5}{7}}\)
Tính nhanh
A = 1 - 2 + 3 - 4 +...+ 49 - 50
F = \(\frac{1}{2}-\frac{2}{3}+\frac{3}{4}+\frac{4}{5}+\frac{2}{3}-\frac{3}{4}-\frac{1}{2}\)
Tính nhanh:
\(\left(\frac{1}{49}-\frac{1}{2^2}\right)\left(\frac{1}{49}-\frac{1}{3^2}\right)...\left(\frac{1}{49}-\frac{1}{40^2}\right)\)
Help me!!!
1)Cho số:
A=3+32+33+........+398+399+3100 .Chứng minh rằng:
a) A chia hết cho 120
b) A không chia hết cho 13
2)Rút gọn
a) A= \(\frac{4^2.25^2+32.125}{2^3.5^2.7}\)
b) B=\(\frac{49^{24}.125^{10}.2^8-5^{30}.7^{49}.4^5}{5^{29}.16^2.7^{48}}\)
3)Rút gọn tổng:
a) A=1+2+22+23+24+........+250
b) B=1+3+32+33+........+3100
