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能简算的要用简便方法计算(1)3-616-716 (2)712+112+512 (3)151
问题详情
能简算的要用简便方法计算 (1)3-616-716
(1)3-6 16- 7 16
(2)7 12+ 1 12+ 5 12
(3)15 16-( 1 5+ 1 16)
(4)1 7+ 1 4+ 6 7+ 2 4
(5)21 13-( 8 13+ 1 10)
(6)2 3- 1 9- 2 9.
参考答案
=3-(616+716)
=3-1316,
=2316;
(2)712+112+512
=712+512+112,
=1+112,
=1112;
(3)1516-(15+116)
=1516-116-15,
=78-15,
=2740;
(4)17+14+67+24
=(17+67)+(14+24)
=1+34,
=134;
(5)2113-(813+110)
=2113-813-110,
=1-110,
=910;
(6)23-19-29
=23-(19+29),
=23-13,
=13.考点:方法