mình sẽ vote 5 sao
1: tìm x biết
a, 3/4 x - 25% . x = -3
b, x-1/5 = 7/x+1
2:tính
A = 3/5 . 4/7 -2/7 . 3/5 -3/6 . 6/7
2/7 + 2/5 + 2/17 + 2/293
B = -----------------------------------
3/7 + 3/5 + 3/17 + 3/293
C= 8/4 . 8/9 . 15/16 ...... 9999/10000
( 1 ) ( 1 ) ( 1 ) ( 1 )
D= ( 1+ ----- ) . ( 1+ ----- ) . ( 1+ ----- ) ........ ( 1+ --------- )
( 1.3 ) ( 2.4 ) ( 3.2 ) ( 99.100 )
Loga
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