问题
填空题
计算:-7+(+2)=______,-5-5=______,-2001
|
答案
-7+(+2)=-7+2=-5;
-5-5=-10;
-2001
×0=0;10 17
(-25)×(+1.2)=25×1.2=-30;
(-1
)×(-2 5
)=-5 49
×(-7 5
)=5 49
;1 7
(-2
)÷(-1 7
)=-5 14
×(-15 7
)=6;14 5
(-1)÷(+
)=-1×3 5
=-5 3
;5 3
÷(-2.5)=-1 6
×1 6
=-2 5
.1 15