(13)(712 - 13 )×27
=699×27
=18873
(14) 36分之5 ÷[( 4分之3 - 6分之1 )×3分之2 ]
=5/36÷[3/4×2/3-1/6×2/3]
=5/36÷[1/2-1/9]
=5/36÷7/18
=5/36×18/7
=5/14
(15)59 ÷[(37 - 114 )×79 ]
=59÷[-77×79]
=59÷（-6083）
=-59/6083
(16)2520÷24+5010
=105+5010
=5115
(17)5-1.05×2.4
=5- 2.52
=2.48
(18) 8分之1 ÷[ 5分之4 ×( 8分之3 +4分之1 )]
=1/8÷[4/5×5/8]
=1/8÷1/2
=1/4