16+112+120+130+1/42+1/56+1/72
=(16+112+120+130)+(1/42+1/56+1/72)
=378+(12/504+9/504+7/504)
=378+(12+9+7)/504
=378+28/504
=378+(28÷28)/(504÷28)
=378+1/18
=378又1/18
16+112+120+130+1/42+1/56+1/72
=(16+112+120+130)+(1/42+1/56+1/72)
=378+(12/504+9/504+7/504)
=378+(12+9+7)/504
=378+28/504
=378+(28÷28)/(504÷28)
=378+1/18
=378又1/18