（1/9+1/4+15/18）×36
=1/9×36+1/4×36+15/18×36
=4+9+30
=43
3/4×0.53+75％×1.47-75％
=0.75×0.53+0.75×1.47-0.75
=0.75×（0.53+1.47-1）
=0.75×1
=0.75
用简便方法计算 （1/9+1/4+15/18）×363/4×0.53+75％×1.47-75％
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