﹙9分之7+3分之2×6分之5﹚÷15分之4 51.6 ÷[﹙3.4-1.25﹚×0.4]急

问题描述:

﹙9分之7+3分之2×6分之5﹚÷15分之4 51.6 ÷[﹙3.4-1.25﹚×0.4]急

﹙9分之7+3分之2×6分之5﹚÷15分之4
=(7/9+5/9)*15/4
=4/3*15/4
=5
51.6 ÷[﹙3.4-1.25﹚×0.4]
=51.6/(2.15*0.4)
=51.6/0.86
=60