简便方法计算:654+823-554,794-299,687+398,4分之1乘101减4分之1,9+99+999+9999

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简便方法计算:654+823-554,794-299,687+398,4分之1乘101减4分之1,9+99+999+9999简便方法计算:654+823-554,794-299,687+398,4分之

简便方法计算:654+823-554,794-299,687+398,4分之1乘101减4分之1,9+99+999+9999
简便方法计算:654+823-554,794-299,687+398,4分之1乘101减4分之1,9+99+999+9999

简便方法计算:654+823-554,794-299,687+398,4分之1乘101减4分之1,9+99+999+9999
654+823-554,
= 654- 554 + 823
= 100 +823
= 923
794-299,
=794 - (300-1)
= 794- 300 +1
= 494 +1
= 495
687+398,
= 687 + 400-2
= 1087- 2
= 1085
4分之1乘101减4分之1,
= 1/4×(101-1)
= 1/4 ×100
= 25
9+99+999+9999
= 10- 1 + 100-1 +1000-1 + 10000-1
= 11110 - 5
= 11105
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