几道分数简算.①(2+3/5)*5 ②3/7*4/5*35 ③5/8*3/8+8/9÷9/8
问题描述:
几道分数简算.①(2+3/5)*5 ②3/7*4/5*35 ③5/8*3/8+8/9÷9/8
④6/7÷3/5-6/7÷3/5
⑤10/9÷3/10+1
答
①(2+3/5)*5 ②3/7*4/5*35 ③5/8*3/8+8/9÷9/8 ④6/7÷3/5-6/7÷3/5 ⑤10/9÷3/10+1
=2X5+(3/5)X5 =(3/7)X35X(4/5) =5/8X3/8+8/9X8/9 =6/7X5/3-6/7X5/3 =10/9X10/3+1
=10+3 =15X(4/5) =15/64+64/81 =6/7X(5/3-5/3) =100/27+1
=13 =12 =5311/5184 =0 =127/27