问题
解答题
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答案
(1)5632÷8+1098÷9,
=704+122,
=826;
(2)9+99+999+9999,
=(10-1)+(100-1)+(1000-1)+(10000-1),
=11110-4,
=11106;
(3)1000-1-2-3-4-…-20,
=1000-(1+2+3+4+…+20),
=1000-(1+20)×20÷2,
=1000-210,
=1000-200-10,
=790.