题目内容
脱式计算.
1200-823+377
648÷8×5
720+1080÷6.
1200-823+377
648÷8×5
720+1080÷6.
(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.
=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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