bài 1 tính
a, 24 x 66 - 24 + 36 x 24
b, 29 x 173 - 29 x 72 -29
c, 1+5+10+15+...+55+60
d, 1x2+2x3+3x4 +...+18x19+19x20
bài 2 tìm x
a,106- ( x+ 7) =9
b, 2 x ( x+ 4) + 5 =65
c, (16x x -32) x 45=0
d, x+4 x x = 100 : 5
(5.x-1):3+1=4
b 54:(16-x)-1=5
c 3^2.x+15=60'''2x^3=54
e 2^x+1=64
a) ( 5.x - 1 ) : 3 + 1 = 4
b) 54 : ( 16 - x ) - 1 = 5
c) 3^2 . x + 15 = 60
d) 2x^3 = 54
e) 2^x+1 = 64
Tính hợp lí nếu có thể:
a)3/7+4/9+4/7+5/9
b)1/5+4/10+9/15+16/20+25/25+36/30+49/35+64/40+81/45
c)1/8+1/12+3/8+5/12
d)(1-1/2)x(1-1/3)x(1-1/4)x...x(1-100)
e)9/5:17/15+8/5:17/15
f)2/1x2+2/2x3+2/3x4+...+2/19x20
Ai nhanh nhất mình tick cho
Tìm số tự nhiên x biết:
a) x - 32 : 16 = 48 b) 88 - 3 . 7 + x = 64
c) 5 + 4 x : 3 - 121 : 11 = 4 d) 15 - 2 3 x + 1 = 11 . 13 - 130
Tìm số tự nhiên x biết:
a) x – 32 : 16 = 48
b) 88 – 3.(7+x) = 64
c) (5+4x) : 3 – 121 : 11 = 4
d) 15 – 2(3x+1) = 11.13 – 130
bài 1 : 1/1x2+1/2x3+1/3x4+1/5x6+1/6x7
Bài 2:1/2+1/6+1/12+1/30+1/42+1/56+1/72
Bài 3: (1-1/2)x(1-1/3)x....x(1-2019)
Bài 4:1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512
Thực hiện các phép tính
B,
1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256
C,
1/1x2 + 1/2x3 + 1/3x4 + ........ + 1/99x100
D,
( 1-1/2 ) x ( 1- 1/3 ) x ( 1-1/4 ) x ....... x ( 1- 1/100 )
Tìm x biết 2x+1/4+1/8+1/16+1/32+1/64=1