Question

51又4分之1×5分之1＋61又5分之1×6分之5＋71又6分之1×7分之6 用简便方法算

Answer 1

(205/4)*(1/5)+(306/5)*(5/6)+(427/6)*(6/7)=41/4+51+61=122又4分之1
题目那是不是51又4分之1乘5分之4

Answer 2

51又1/4×4/5+61又1/5×5/6+71又1/6×6/7

=51X4/5+1/4X4/5 + 61X5/6+1/5X5/6 +71X6/7+1/6X6/7

=50X4/5+4/5+1/5 +60X5/6+5/6+1/6 +70X6/7+6/7+1/7

=40+1+50+1+60+1

=153