Bài 1: Tính
dfrac{1}{4}+dfrac{5}{10}-dfrac{1}{3}-dfrac{7}{8}
Bài 2:Tính bằng cách hợp lí
a) A 11dfrac{3}{13}-left(2dfrac{4}{7}+5dfrac{3}{13}right)
b) B left(6dfrac{4}{9}+3dfrac{7}{11}right)-4dfrac{4}{9}
c) C dfrac{-5}{7}.:dfrac{2}{11}+dfrac{-5}{7}.dfrac{9}{11}+1dfrac{5}{7}
d) D 0,7.:2dfrac{2}{3}.20.:0,375.:dfrac{5}{28}
e) E left(-6,17+3dfrac{5}{9}-2dfrac{36}{97}right).left(dfrac{1}{3}-0,25-dfrac{1}{12}right)
Bài 5: Tính nhanh
A25.20,04+4.20,04-2004.20,33+2004.20,04
Bài 6: So sánh
dfr...
Đọc tiếp
Bài 1: Tính
\(\dfrac{1}{4}+\dfrac{5}{10}-\dfrac{1}{3}-\dfrac{7}{8}\)
Bài 2:Tính bằng cách hợp lí
a) A= \(11\dfrac{3}{13}-\left(2\dfrac{4}{7}+5\dfrac{3}{13}\right)\)
b) B= \(\left(6\dfrac{4}{9}+3\dfrac{7}{11}\right)-4\dfrac{4}{9}\)
c) C= \(\dfrac{-5}{7}.\:\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+1\dfrac{5}{7}\)
d) D= \(0,7.\:2\dfrac{2}{3}.20.\:0,375.\:\dfrac{5}{28}\)
e) E= \(\left(-6,17+3\dfrac{5}{9}-2\dfrac{36}{97}\right).\left(\dfrac{1}{3}-0,25-\dfrac{1}{12}\right)\)
Bài 5: Tính nhanh
A=\(25.20,04+4.20,04-2004.20,33+2004.20,04\)
Bài 6: So sánh
\(\dfrac{10^5+4}{10^5-1}\)và \(\dfrac{10^5+3}{10^5-2}\)