(-0.125)^15*(2^15)^3-5/7^2014*(-7/5)^2013
1-1+2-3+4-5+6-7+.-2013+2014
函数````````````````````````` (5 15:3:7)
3/19*5/7*7/15求简算
3X+3*2Y=2*15 5X+5*7Y=5*15
简算 0.125×15分之7+15分之7×8分之3+2分之1×15分之7
求-1+2-3+4-5+6-7+8.-2013+2014,这2014个数的和.
7X=2X+15 15=7X-2X 15=5X 5X=15 X=15/5 X=3
1,2,3,3,7,5,15,9,31,( )
7+(3x-2)/2=(15-50x)/5
9/2×5/3 7/6×9/7 8/5×15/4 20/9×21/5
1 1,2 2 ,3,5,5,7,10,15 15,20,27,37,52 ( ) ( ) ( ) ( ) ( ) 看上
说出下面各算式的意义15x4 5x0.12 0.12x5 2/7x2/5 2/7x5 1÷0.125 4/1÷2/3 5