Các câu hỏi tương tự
4/17-4/49-4/131: 3/17-3/49-3/131
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TÍNH HỢP LÍa)frac{frac{4}{17}-frac{4}{49}-frac{4}{131}}{frac{-3}{17}+frac{3}{49}+frac{3}{131}}b)frac{-1}{2}+frac{3}{5}+frac{-1}{9}+frac{1}{27}+frac{7}{18}+frac{4}{35}+frac{2}{7}c)frac{3.8.15....9999}{4.9.16.....10000}d)frac{frac{1}{2}+frac{1}{3}+frac{1}{4}+...+frac{1}{2000}}{frac{1999}{1}+frac{1998}{2}+frac{1997}{3}+...+frac{1}{1999}}
Đọc tiếp
TÍNH HỢP LÍ
a)\(\frac{\frac{4}{17}-\frac{4}{49}-\frac{4}{131}}{\frac{-3}{17}+\frac{3}{49}+\frac{3}{131}}\)
b)\(\frac{-1}{2}+\frac{3}{5}+\frac{-1}{9}+\frac{1}{27}+\frac{7}{18}+\frac{4}{35}+\frac{2}{7}\)
c)\(\frac{3.8.15....9999}{4.9.16.....10000}\)
d)\(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2000}}{\frac{1999}{1}+\frac{1998}{2}+\frac{1997}{3}+...+\frac{1}{1999}}\)
tinh:a)(-29)+61+29-31
b)(131-93-16)-(131-93-4)
c)C=0-1-3-5-7...49-51
bài 1:
a) 10\17+5\-13-11\25+7\17-8\13
b) 0,3-93\7-70%0-4\7
c)1\8+1\24+1\48+...+1\2400
d) 3\41-12\17+33\49
-----------------------------
12\41-48\17+132\49
Tính:
a) 17 . 85 + 25 . 17 + 1200
b) 62 : 4 . 3 + 2 . 52
c) 5 . 42 - 18 : 32
d) 3 . 52 - 16 : 23 + 34 : 33
e) 220 - [ 32 . 33 - ( 12 - 70 ) 2 ]
j) 49 . 73 + 49 . 51 - 49 . 24
Rút gọn :
a) A = 2 + 22 + 23 +...+ 229
b) B = 1 + 3 + 32 + 33 + ... + 339
c) C = 4 + 42 + 43 + 44 + ... + 449
d) D = 1 + 7 + 72 + 73 + ... + 779
Tính nhanh.
a) (-4).(-8).(-17).(-25).125
b) (236 – 362) – (638 + 463)
c) (- 325 – 147) – ( - 625 + 853) – (-96)
d) 69.(- 47) – 31. (- 47)
e) 98. (- 37) + (- 49).126
f) – 35. (49 – 125) – 125 .(35 – 49)
g) 2 + 4 – 6 – 8 + 10 + 12 – 14 – 16 + …+ 90 + 92 – 94 – 96
h) 1 + 3 + 3 2 + 3 3 + ….+ 3 50
1 . Tìm x biết :
a . 2x - ( x + 15 - 29 ) = 17 - 11
b . 49 - ( x - 12 + 54 ) = 2x + 49
c . ( 2x - 5 ) . 2 = 49
d . 2 . | x - 3 | -1 = 6
e . 3 . | x + 1 | - 2 = 4
f . 4 x + 2 + 4 x = 1088
1,Thu gọn biểu thức
a,B= -3(12a-21b+23)-4(-22a+15b-41)+(-11a-b+29)
b,C=(-18a-43b+49)-2(54a-27b+25)+3(-15a+22b-17)
rút gọn
c) C = 4 + 42 + 43 + 44 + ... + 449
d) D = 1 + 7 + 72 + 73 + ... + 779