3105:[160-(2x-7)]=23
160-(2x-7)=135
2x-7=25
2x=32
x=16
=>160-(2x-7)=135
=>2x-7=25
=>2x=32
=>x=16
160 - ( 2x - 7 ) = 3105 ÷ 23
160 - ( 2x - 7 ) = 135
2x - 7 = 160 - 135
2x - 7. = 25
2x = 25 + 7
2x = 32
x = 32 ÷ 2
x = 16
3105:[160-(2x-7)]=23
160-(2x-7)=135
2x-7=25
2x=32
x=16
=>160-(2x-7)=135
=>2x-7=25
=>2x=32
=>x=16
160 - ( 2x - 7 ) = 3105 ÷ 23
160 - ( 2x - 7 ) = 135
2x - 7 = 160 - 135
2x - 7. = 25
2x = 25 + 7
2x = 32
x = 32 ÷ 2
x = 16
Bài 1 : Tính giá trị biểu thức sau :
A= ( 1/7 + 1/23 - 1/1009 ) : ( 1/23 + 1/7 - 1/1009 + 1/7 . 1/23 . 1/1009 ) + 1 : ( 30 . 1009 - 160 )
Bài 2 : Tìm số tự nhiên x biết :
a) ( 1/1.2.3 + 1/2.3.4 + .... + 1/8.9.10 ) b) 5^x = 125 c) 3^2x = 81 d) 5^2x-3 - 2.5^2 = 5^2 .3
A=1/7+1/23-1/1009/(1/23+1/7-1/1009+1/7*1/23/1/1009)+1/(30/1006-160) tinh gia tri bieu thuc
B=(1/7+1/23-1/1009):(1/7+1/23-1/1009+1/7x1/23x1/1009)+1:(30x1009-160)
Tính nhanh A= (1/7 + 1/23 - 1/1009) : ( 1/23 + 1/7 - 1/1009 + 1/7. 1/23.1/1009) +1: (30.1009-160)
tính : A=(1/7+1/23-1/1009):(1/23+1/7-1/1009+1/7x1/23x1/1009)+1:(30x1009-160)
1+7+8+15+23+...+160
1+7+8+15+23+.......+160= ?
1+7+8+15+23+...+160
Tính giá trị biểu thức sau: A= (1/7+ 1/23 - 1/1009):( 1/23+1/7 -1/1009 + 1/7 x 1/23 x 1/1009 )+ 1 : ( 30 x 1009 - 160 )