Tìm x: |x + 1/1.2| + |x + 1/2.3| + |x + 1/3.4| + ... + |x + 1/99.100| = 100x

Tìm x:
a) |x + 1/1.2| + |x + 1/2.3| + |x + 1/3.4| + ... + |x + 1/99.100| = 100x
b) |x + 1/1.3| + |x + 1/3.5| + |x + 1/5.7| + ... + |x + 1/97.99| = 50x
c) |x + 1/1.5| + |x + 1/5.9| + |x + 1/9.13| + .. + |x + 1/397.401| = 101x