1.2.3题,
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1.2.3题,
1.2.3题,
1.2.3题,
(1)15×(338-109)
=15×229
=3435
(2)15×27+15
=405+15
=420
(3)99999-353×35
=99999-12355
=87644
4.5.6
1.2.3题,
1.2.3题,
1.2.3题,
(1)15×(338-109)
=15×229
=3435
(2)15×27+15
=405+15
=420
(3)99999-353×35
=99999-12355
=87644
4.5.6