问题
解答题
计算 (1)22-(-4)+(-2)+4; (2)1+(-2)+|-2-3|-5; (3)(-5)×
(4)(2
|
答案
(1)原式=22+4+(-2)+4=30+(-2)=28;
(2)原式=1+(-2)+5+(-5)=-1;
(3)原式=1+0=1;
(4)原式=
×(-9 4
)-8 9
×(-9 2
)-8 9
×(-9 8
)=-2-(-4)+1=-2+4+1=-2+5=3.8 9