题目内容
137+29+63
25×7×4
16×45.
25×7×4
16×45.
(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.
=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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