题目内容
计算:
(1)0 -(-10)-(-15)-(+5);
(2)
;
(3)
;
(4)(-5.2)+(+3.8)-(-1.2)+(-0.5)+(-0.77);
(5) -2×(-3)2;
(6)-32+(-2)3×2;
(7)(-4)2÷(-8)-52;
(8) -0.252÷
×(-1)27。
(1)0 -(-10)-(-15)-(+5);
(2)
(3)
(4)(-5.2)+(+3.8)-(-1.2)+(-0.5)+(-0.77);
(5) -2×(-3)2;
(6)-32+(-2)3×2;
(7)(-4)2÷(-8)-52;
(8) -0.252÷
解:(1)原式=10 +15-5= 20;
(2)原式=
=
;
(3)原式=

;
(4)原式=-5.2 -0.5 -0.77 +3.8 +1.2 =-5.7 -0.77+5=-5+5-0.7-0.77=-1.47;
(5)原式=-2×9=-18;
(6)原式=-9+(-8)×2= -9+(-16)=-25;
(7)原式=16×
-25=-2-25=-27;
(8)原式=
。
(2)原式=
(3)原式=
(4)原式=-5.2 -0.5 -0.77 +3.8 +1.2 =-5.7 -0.77+5=-5+5-0.7-0.77=-1.47;
(5)原式=-2×9=-18;
(6)原式=-9+(-8)×2= -9+(-16)=-25;
(7)原式=16×
(8)原式=
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