一、直接写的数 二、计算（都是分数的）注：（分母在前分子在后）一、直接写的数 4/3*12= 7/5+7/2= 3/2*4/3= 60*12/5= 8/7-4/3= 10/1*1又4/1= 9/2*1又5/1= 7/5*5/14=二、计算2又2/1*15/1+3/1*2/1 (3/2+1又5/2)*7/5 (4/3+3

一、直接写的数 二、计算（都是分数的）注：（分母在前分子在后）一、直接写的数 4/3*12= 7/5+7/2= 3/2*4/3= 60*12/5= 8/7-4/3= 10/1*1又4/1= 9/2*1又5/1= 7/5*5/14=二、计算2又2/1*15/1+3/1*2/1 (3/2+1又5/2)*7/5 (4/3+3
一、直接写的数 二、计算（都是分数的）
注：（分母在前分子在后）
一、直接写的数
4/3*12= 7/5+7/2= 3/2*4/3= 60*12/5= 8/7-4/3= 10/1*1又4/1= 9/2*1又5/1= 7/5*5/14=
二、计算
2又2/1*15/1+3/1*2/1 (3/2+1又5/2)*7/5 (4/3+3/2)*1又7/1 7又4/3-1.25+2又5/1 (1又8/1+4/1)+2又3/1
(9/1+6/1)*1又5/1
下午就要交了,

一、直接写的数 二、计算（都是分数的）注：（分母在前分子在后）一、直接写的数 4/3*12= 7/5+7/2= 3/2*4/3= 60*12/5= 8/7-4/3= 10/1*1又4/1= 9/2*1又5/1= 7/5*5/14=二、计算2又2/1*15/1+3/1*2/1 (3/2+1又5/2)*7/5 (4/3+3
你好,正确的写法是分子在前分母在后,做法几乎全部一样,
就是交叉化简,若不能化简则分子乘分子,分母乘分母.

3/4 *12 5/7+2/7 2/3*3/4 60*5/12 7/8-3/4 1/10 * 1又1/4
=3*3 =(5+2)/7 =2 * 1/4 =5*5 =7/8 - 6/8 =1/10 * 5/4
=9 =1 =2/4 =25 =1/8 =1/2 * 1/4
=1/2 =1/8

2/9 * 1又1/5 5/7 * 14/5 2又1/2 * 1/15 + 1/3 *1/2 (2/3+1又2/5)*5/7
=2/9 * 6/5 =1 * 2 =5/4 * 1/15 + 1/6 =2/3 * 5/7 + 7/5 * 5/7
=2/3 * 2/5 =2 =1/4 * 1/3 +1/6 =10/21 +1
=4/15 =1/12 + 2/12 =1又10/21
=1/4

(3/4+2/3)*1又1/7 (2/3+1又2/5)*5/7 7又3/4 - 1.25+2又1/5
=3/4 * 8/7 + 2/3 * 8/7 =2/3 * 5/7 + 7/5 * 5/7 =28/4 - 5/4 + 11/5
=3 * 2/7 + 16/21 =10/21 + 1 =23*5/20 + 11*4/20
= 18/21 + 16/21 =1又10/21 =7又19/20
= 1又13/21

(1又1/8+1/4)+2又1/3 (1/9+1/6)*1又1/5
=9/8 + 1/4 + 7/3 =5/18 * 6/5
=27/24 + 6/24 + 56/24 =1/3
=89/24
=3又17/24

无疑问,望采纳.
祝学业进步^-^