问题
填空题
计算下列各题: (1)1-2+3=______; (2)-2×(-7)=______; (3)(-1)2-|-5|=______; (4)10÷(-5)=______; (5)2÷(-
(6)(-3)2-3÷
(7)(-2)3-32=______; (8)2a-5-3a+1=______. |
答案
(1)1-2+3=(1+3)-2=4-2=2;
故答案为:2;
(2)-2×(-7)=14;
故答案为:14;
(3)(-1)2-|-5|=1-5=-4;
故答案为:-4;
(4)10÷(-5)=-2;
故答案为:-2;
(5)2÷(-
)=2×(-6)=-12;1 6
故答案为:-12;
(6)(-3)2-3÷
=9-6=3;1 2
故答案为:3;
(7)(-2)3-32=-8-9=-17;
故答案为:-17;
(8)2a-5-3a+1=2a-3a-5+1=-a-4.
故答案为:-a-4.