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计算:(1)6+11+16+…+501(2)1+5+9+13+…+1989+1993.

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(1)(501-6)÷(11-6)+1,
=495÷5+1,
=100,
(6+501)×100÷2,
=507×100÷2,
=25350;
(2)(1993-1)÷(5-1)+1,
=1992÷4+1,
=498+1,
=499,
(1+1993)×499÷2,
=1994×499÷2,
=995006÷2,
=497503.