下面各题怎样简便就怎样算.(1)2.7×99+2.7 (2)34+16-38(3)3.93+1.64+6.07+8.36(4)(7.9-3.06÷0.51)×5(5)15
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| 下面各题怎样简便就怎样算. (1)2.7×99+2.7 (2) (3)3.93+1.64+6.07+8.36 (4)(7.9-3.06÷0.51)×5 (5)15-11.17-2.83 (6)15×( |
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(1)2.7×99+2.7,
=2.7×(99+1),
=2.7×100,
=270;
(2)34+16-38,
=1824+424-924,
=1324;(3)3.93+1.64+6.07+8.36,
=(3.93+6.07)+(1.64+8.36),
=10+10,
=20;(4)(7.9-3.06÷0.51)×5,
=(7.9-6)×5,
=1.9×5,
=9.5;(5)15-11.17-2.83,
=15-(11.17+2.83),
=15-14,
=1;(6)15×(13+15),
=15×13+15×15,
=5+3,
=8.
