题目:
计算
(1)22-(-4)+(-2)+4;
(2)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 );
(3)(-5)×
×(-
)×
×0;
(4)(-12.5)×(-2.5)×(-4)×(-8).
(5)-6-(-3.5)+(-2.5)
(6)-32-17+|-23|
(7)
(-2)-(-4.7)-(+0.5)+(+2.4)+(-3.2)(8)(+16)+(-29)-(-7)-(+11)+(+9)
(9)(-3.1)-(-4.5)+(+4.4)-(+1.3)+(-2.5)
答案
解:(1)原式=22+4-2+4
=28;
(2)原式=[(-0.6+0.6)]+[(1.7-1.7)-9]
=-9;
(3)原式=0;
(4)原式=[(-12.5)×(-4)]×[(-2.5)×(-8)]
=50×20
=1000;
(5)原式=-6+3.5-2.5
=-5;
(6)原式=-32-17+23
=-16;
(7)原式=-2.4+4.7-0.5+2.4-3.2
=2.3-0.5+2.4-3.2
=1;
(8)原式=15-29+7-11+9
=-9;
(9)原式=-3.1+4.5+4.4-1.3-2.5
=1.4+4.4-1.3-2.5
=5.8-1.3-2.5
=2.
解:(1)原式=22+4-2+4
=28;
(2)原式=[(-0.6+0.6)]+[(1.7-1.7)-9]
=-9;
(3)原式=0;
(4)原式=[(-12.5)×(-4)]×[(-2.5)×(-8)]
=50×20
=1000;
(5)原式=-6+3.5-2.5
=-5;
(6)原式=-32-17+23
=-16;
(7)原式=-2.4+4.7-0.5+2.4-3.2
=2.3-0.5+2.4-3.2
=1;
(8)原式=15-29+7-11+9
=-9;
(9)原式=-3.1+4.5+4.4-1.3-2.5
=1.4+4.4-1.3-2.5
=5.8-1.3-2.5
=2.