问题 解答题

脱式计算.

1200-823+377

648÷8×5

720+1080÷6.

答案

(1)1200-823+377,

=1200-(800+23)+(400-23),

=1200-800-23+400-23,

=(1200-800+400)-(23+23),

=800-46,

=754;

(2)648÷8×5,

=81×5,

=405;

(3)720+1080÷6,

=720+180,

=900.

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