简便运算:25×398

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简便运算:25×398简便运算:25×398简便运算:25×39825×398=25×(400-2)=25×400-25×2=10000-50=995025×398=25x(400-2)=25x400

简便运算:25×398
简便运算:25×398

简便运算:25×398
25×398
=25×(400-2)
=25×400-25×2
=10000-50
=9950

25×398
=25x(400-2)
=25x400-25x2
=10000-50
=9950

9950