题目内容
【题目】2+1 9﹣5 6﹣4 4﹣3
9﹣3 4﹣2 1﹣0.45+ 3+4.25﹣
2+3.75﹣1 6.875+(4.5﹣1) 6.94﹣(4.94+1) 4﹣1﹣0.2.
【答案】3;4;1;1;5;1;1.7;7;4;9;;2.9
【解析】
试题分析:(1)、(2)、(3)、(4)、(5)、(6)是带分数的加减法,整数部分和分数部分分开进行加减;
(7)、(12)把分数化成小数再计算;
(8)、(9)、(10)、(12)把小数化成分数再计算;
(11)去掉括号后在计算.
解:(1)2+1,
=(2+1)+(+),
=3+,
=3;
(2)9﹣5,
=(9﹣5)+(﹣),
=4+,
=4;
(3)6﹣4,
=5+1﹣4,
=(5﹣4)+(1﹣),
=1+,
=1;
(4)4﹣3,
=(4﹣3)+,
=1+,
=1;
(5)9﹣3,
=8﹣3,
=(8﹣3)+(﹣),
=5+,
=5;
(6)4﹣2,
=3﹣2,
=(3﹣2)+(﹣),
=1+,
=1;
(7)1﹣0.45+,
=1.75﹣0.45+0.4,
=1.3+0.4,
=1.7;
(8)3+4.25﹣,
=3+4﹣,
=(3+4)+(+﹣),
=7+,
=7;
(9)2+3.75﹣1,
=2+3﹣1,
=(2+3﹣1)+(+﹣),
=4+,
=4;
(10)6.875+(4.5﹣1),
=6+4﹣1,
=(6+4﹣1)+(+﹣),
=9+,
=9;
(11)6.94﹣(4.94+1),
=6.94﹣4.94﹣1,
=2﹣1,
=2﹣1﹣,
=1﹣,
=;
(12)4﹣1﹣0.2,
=4.9﹣1.8﹣0.2,
=3.1﹣0.2,
=2.9.
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