（3.8-1.8÷2）×0.5 1/4×4÷1/4×4 8/13÷7+1/7×5/13 以上几道题的简便算法和一般算法（

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简便算法：
（3.8-1.8÷2）×0.5
=(3.8-0.9)×0.5
=3.8×0.5-0.9×0.5
=1.45
1/4×4÷1/4×4
=(1/4÷1/4)×4×4
=4×4
=16
8/13÷7+1/7×5/13
=8/13×1/7+1/7×5/13
=1/7×(8/13+5/13)
=1/7
普通算法：
（3.8-1.8÷2）×0.5
=(3.8-0.9)×0.5
=2.9×0.5
=1.45
1/4×4÷1/4×4
=1÷1/4×4
=4×4
=16
8/13÷7+1/7×5/13
=8/91+5/91
=13/91
=1/7

第一题：
=（3.8-0.9）*0.5
=2.9*0.5
=1.45
第二题：
=16
第三题：
=8/91+5/91
=1/7

（3.8-1.8÷2）×0.5
=(3.8-0.9)×0.5
=3.8×0.5-0.9×0.5
=1.45
1/4×4÷1/4×4
=(1/4÷1/4)×4×4
=4×4
=16
8/13÷7+1/7×5/13
=8/13×1/7+1/7×5/13
=1/7×(8/13+5/13)
=1/7
普通算法：...

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