1、0-12= 2、-12-34= 3、8+(-2)= 4、(5-6)-(7-9)=
1、0-12= 2、-12-34= 3、8+(-2)= 4、(5-6)-(7-9)=
3-{(-3)-12}= 8-(9-10)= (3-5)-(6-10)= 0-1+2-3+4-5= -4.2+5.7-8
已知十组数据,x=(1,2,3,4,5,6,7,8,9,10)y=(12,23,25,34,62,52,41,15,67
用简便计算:17/20-(5/12+7/20)= 2/9+5/6-(5/6-4/9)= 7/12-1/4-1/8+5/1
1+2-3-4+5+6-7-8+9+10-11-12+.+2005+2006=(要过程(简算))
4/7*( )=5/12除以( )=7/8除以( )=1/6*( )=1/2
0 1 2 3 4 5 6 7 8 9 ( )+( )=( ) ( )-( )=( ) ( )乘( )=( )每个数只
()12+()11+()10+()9+()8+()7+()6+()5+()4+()3+()2+()1=0括号里填+/-
(8/9-5/12)x=34 x*(1-3/8)=5/3
0+1+2-3-4+5+6-7-8+9+10-11-12``````-2008+2009=?
(34 5 6 8 9 1)2 = 2008
5+(-9)= 11-(+7)= (-12)-(+2.1)= -(-15)-(-8) (-2/3)