7分之6×23分之4+23分之6*7分之3
=4/7x6/23+6/23x3/7
=6/23x(4/7+3/7)
=6/23x1
=6/23
8分之5÷7分之5+5分之2×4分之1
=7/8+1/10
=0.875+0.1
=0.9758分之5÷7分之5+5分之2×4分之1=答案不是40分之39吗？0.975=39/40 呀