七年级口算训练（一）-5-8= -9-5= 2-9= 3-8= -3+7= -11+15= +9-25= -10-5= -25-18= -19-5= 20-9= 13-8= -3+17= -16+15= +9-15= -10-15= 12-9= 13-8= -32+7= -17+15= +19-25= -35-8= -9-25= 22-9= 35-18= -43+7= -16+14= +9-14=-45-18= -3-29= 21-19= 31-13= -41+27= -26+14= +21-15= -4-1= -13-2= 1-19= 31-3= -51+7= = = = = -5（-2）= 6（-2.5）=