拆开来做.
7又5/6 = 7 + 5/6
0.125 = 1/8 所以 (4.125—4又1/8)= 0
4又5/6 = 4 + 5/6
所以 【7又5/6+(4.125—4又1/8)—4又5/6】 = 7 + 5/6 + 0 - 4 - 5/6 = 3
1又2/3* 3 = 1*3 + 2/3 *3 = 3 + 2 = 5
拆开来做.
7又5/6 = 7 + 5/6
0.125 = 1/8 所以 (4.125—4又1/8)= 0
4又5/6 = 4 + 5/6
所以 【7又5/6+(4.125—4又1/8)—4又5/6】 = 7 + 5/6 + 0 - 4 - 5/6 = 3
1又2/3* 3 = 1*3 + 2/3 *3 = 3 + 2 = 5