34=9*()=():8=12()
(8/9-5/12)x=34 x*(1-3/8)=5/3
1、0-12= 2、-12-34= 3、8+(-2)= 4、(5-6)-(7-9)=
(34 5 6 8 9 1)2 = 2008
12()34()5()4()6()8=2008
9/()=0.75=():8=12/()=()%
24/()=()除以9=15/()=12/8=3/2
43-34=()*()=()
5+(-9)= 11-(+7)= (-12)-(+2.1)= -(-15)-(-8) (-2/3)
( ):8=12/( )=9÷( )=0.75
7 8 9 10 11 12 13 填空 ()+()=()+()=()+()
1/4*(-8/9)=?(-5/6)*(-3/10)=?-34/15*25=?(-0.3)*(-10/7)=?
()除8=8分之3=32分之12=9除()=()填小数.