有向數(向數的混合題)

1.	(-4)-(+3)+(-7) =-4-3-7 =-14	2.	(-10)-(-5)+2 =-10+5+2 =-5+2 =-3	3.	(-12)+(-2)-(-5) =-12-2+5 =-14+5 =-9
4.	17-6-(-4) =17-6+4 =11+4 =15	5.	(+4)(-3)(-2) =-12*-2 =24	6.	[(2)(6)]/(-18) =12/-18 =-2/3
7.	(-24)/[(+3)(-6)] =-24/-18 =4/3	8.	16-[(9-7)-(5-2)] =16-(2-3) =16-(-1) =17	9.	4*[-3-(-7)] =4*(-3+7) =4*4 =16
10.	(3-5)/(8-2) =-2/6 =-1/3	11.	(7-16)/(11-9) =-9/2	12.	2+(4-8)+(-7)+11 =2+4-7+11 =-2-7+11 =-9+11 =2
13.	-11+(9-15)-(-8/2) =-11-6+8*1/2 =-17+4 =-13	14.	(6-7)*(3/4)*(9-6) =-1*3/4*3 =-9/4