问题
解答题
计算:(1)(-20)+(-3)-(-5)-(+7) (2)1÷(-5)×(-
|
答案
(1)原式=(-20)+(-3)+5+(-7)
=-(20+3+7)+5
=-30+5
=-(30-5)
=-25;
(2)原式=1×(-
)×1 5 1 25
=-
.1 125
计算:(1)(-20)+(-3)-(-5)-(+7) (2)1÷(-5)×(-
|
(1)原式=(-20)+(-3)+5+(-7)
=-(20+3+7)+5
=-30+5
=-(30-5)
=-25;
(2)原式=1×(-
)×1 5 1 25
=-
.1 125