问题 解答题

137+29+63

25×7×4

16×45.

答案

(1)137+29+63

=137+63+29

=200+29

=229;

(2)25×7×4

=25×4×7

=100×7

=700;

(3)16×45

=16×5×9

=80×9

=720.

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