959-31*(72-43)递等式怎么计算呢?还有 16*25*19又怎么计算呢? (递等式哦)谢谢大家帮助
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/31 20:05:49
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959-31*(72-43)递等式怎么计算呢?还有 16*25*19又怎么计算呢? (递等式哦)谢谢大家帮助
959-31*(72-43)递等式怎么计算呢?还有 16*25*19又怎么计算呢? (递等式哦)谢谢大家帮助
959-31*(72-43)递等式怎么计算呢?还有 16*25*19又怎么计算呢? (递等式哦)谢谢大家帮助
959 - 31 * (72 - 43)
=959 - 31 * 29
=959 - (30-1)(30+1)
=959 - (30^2 - 1^2)
=959 - (900 - 1)
=959 - 900 + 1
=60
16 * 25 * 19
= 4 * (4 * 25) * (20 - 1)
=400 * (20 - 1)
=8000 - 400
=7600
是简便计算吗