1.
9999x71=71(A-1)
9999=A-1
A=10000
2.
12a-36=12
12a=48
a=4
3.
1又7分5x2又5分4=?
(1+5/7)x(2+4/5)
=(12/7) x (14/5)
=12 x (2/5)
=24/5
4.
3又3分2x4又11分之1x15分之7
(3+2/3)x(4+1/11)x(7/15)
=(11/3) x (45/11) x (7/15)
=15 x (7/15)
=7
5.
12又3分2/3又6分1
=(12+2/3)/(3+1/6)
=(38/3) / (19/6)
=(38/3) x (6/19)
=4
6.11又11分之2/2又4分1/3又3分2
=(11+2/11)/(2+1/4)/(3+2/3)
=(123/11) / (9/4) / (11/3)
=(123/11) x (4/9) x (3/11)
=164/121
很多也很容易哦
你真的是不懂嗎?
如果這些也不懂記得要向老師求助