①122-36+64=122-(36+64)=122-100=22订正:①______②99×25=(100-1)×25=100-1×25=75订正:②______③720÷(8×3)=720÷8×3

题目简介

①122-36+64=122-(36+64)=122-100=22订正:①______②99×25=(100-1)×25=100-1×25=75订正:②______③720÷(8×3)=720÷8×3

题目详情

①122-36+64
=122-(36+64)
=122-100
=22 订正:①______
②99×25
=(100-1)×25
=100-1×25
=75订正:②______
③720÷(8×3)
=720÷8×3
=90×3
=270 订正:③______.
题型:解答题难度:中档来源:不详

答案

①122-36+64,
=86+64,
=150;

②99×25,
=(100-1)×25,
=100×25-25×1,
=2500-25,
=2475;

③720÷(8×3),
=720÷24,
=30.

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