17119:(119-714:7)+3302:13-567
tinh nhanh
a.1008-17119:(119-714:7)
b.2814:14-(23.52-156).2
c.412-[124-(42.23-268:4)]
3 tik
a) 3 . 52 - 16 : 22
b) 23 . 17 - 23 . 14
c) 20 - [ 30 - ( 5 - 1)2 ]
d) 1008 - 17119 : ( 119 - 714 : 7)
A= 30-{60-[2+(17-3x4)]}:15
B=1800-{120-[36-(90:15x3)]}x15
C=2017-17119:(119-714:7)x2
D=128x430-6795+675+34125:375x15
E=5871:103+(247-82)-5-745
LUƯ Ý!! TÍNH NHANH GIÁ TRỊ BIỂU THỨC
bài 1: tính nhanh
a,15 x 12 + 15 x 4 +15
b, 3 x 125 x 121 x 8
c, 98 x 122 + 264
d, 367 + 129 + 133 + 371 + 17
bài 2: tìm x
a, ( x + 60 ) - 160 = 0
b, 4221 : ( x - 16 ) = 21
c, 7 x x - 7 = 714
d, 4 x x : 13 = 0
e, 0 : x = 0
g, 2448 : [ 119 -(x - 6)] = 24
1,. Tính
A=10101*(5/111111+5/222222+4/3*7*11*13*37
2, Rut gon phan so
A. 6*9-2*17/63*3-119
B. 2*3+4*6+14*21/3*5+6*10+21*35
Rút gọn P/S:
a) -315/540
b) 25*13 / 26*35
c) 6*9-2*17 / 63*3-119
d) 3*13-13*18 / 15*40-80
e) (-5)^3 * 40 * 4^3 / 135 * (-2)^14 * (-100)^0
f) 2929-101/2*1919+404
g) -1997*1996+1/(-1995)*(-1997)+1996
h) 2*3+4*6+14*21/3*5+6*10+21*35
i) 3*7*13*37*39-10101/505050-70707
Tính: B=1-2-3+4-5-6+...+118-119-120
C=1-2-3-+5-6-7-8+....+117-118-119-120
tính các tổng sau
1) A = 1+7+7^2+7^3+....+7^2007
2) B= 1+4 +4^2+4^3+....+4^100
3) C= 1+3^2 +3^4 +3^6+3^8+....+3^100
4) D= 7+7^3 + 7^5+7^7+7^9+....+7^99
5)E= 2+2^3+2^5+2^7+2^9+....+2^2009
6) B = 1+2^2+2^4+2^6+2^8+....+2^200
7) C= 5+5^3+5^5+5^9+....+5^101
8) D = 13+13^3+13^5+...+13^99
