723-181-19 46×101-146 62×10-62×2怎么简便运算?

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723-181-19 46×101-146 62×10-62×2怎么简便运算?

723-181-19 46×101-146 62×10-62×2怎么简便运算?
723-181-19 46×101-146 62×10-62×2怎么简便运算?

723-181-19 46×101-146 62×10-62×2怎么简便运算?
723-181-19
=723-(181+19)
=723-200
=523
46×101-146
=46x(100+1)-146
=46x100+46-146
=4600-(146-46)
=4600-100
=4500
62×10-62×2
=62x(10-2)
=62x8
=496

723-181-19
=723-(181+19)
=723-200
=523
46×101-146
=46×101-46-100
=46×(101-1)-100
=46×100-100
=4600-100
=4500
62×10-62×2
=620-124
=620-120-4
=500-4...

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723-181-19
=723-(181+19)
=723-200
=523
46×101-146
=46×101-46-100
=46×(101-1)-100
=46×100-100
=4600-100
=4500
62×10-62×2
=620-124
=620-120-4
=500-4
=496

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