问题
解答题
计算: (1)(-30)-(-28)+(-70)-88 (2)-[3.5-(-1.13)-(-0.33)]+2.5 (3)(-11
(4)1-
(5)(1-1
(6)-23÷
|
答案
(1)原式=-30+28-70-88
=-100-60
=-160;
(2)原式=-[3.5+1.13+0.33]+2.5
=-4.96+2.5
=-2.46;
(3)原式=
×45 4
×4 3
×3 10
×10 3 3 5
=9;
(4)原式=1-
×(2+3)21 25
=1-
×251 25
=1-1
=0;
(5)原式=1×(-24)-
×(-24)-3 2
×(-24)+3 8
×(-24)7 12
=-24+36+9-14
=7;
(6)原式=-8×
×9 4
-4 9
-5×(-4 5
)1 4
=-8-
+4 5 5 4
=-7
.11 20