问题
解答题
计算 (1)(-4)-(+8)-(-5)+(-9); (2)(-5)×(-7)-5×(-6) (3)(-9)÷
(4)(1-
(5)3+50÷(-2)2×(-
|
答案
(1)原式=-4-8+5-9
=-12+5-9
=-7-9
=-16;
(2)原式=35+30
=65;
(3)原式=(-9)×
×2 3
×(-2 3
)1 4
=(-6)×
×(-2 3
)1 4
=(-4)×(-
)1 4
=1;
(4)原式=1×(-12)-
×(-12)-1 2
×(-12)1 3
=-12+6+4
=-2;
(5)原式=3+50÷4×(-
)-11 5
=3+50×
×(-1 4
)-11 5
=3+
×(-25 2
)-11 5
=3-
-15 2
=-
.1 2