问题
解答题
计算: ①-
②90-(-3) ③-0.5-(-3
④(-4
|
答案
①-
+(+7 5
)=-1.3; 1 10
②90-(-3)=93;
③-0.5-(-3
)+2.75-(+71 4
) 1 2
=(-0.5-7.5)+(3
+2.75)1 4
=-8+6
=-2;
④(-4
)-(-37 9
)-(+21 6
)+(-62 9
)1 6
=(-4
-27 9
)+(32 9
-61 6
)1 6
=-7-3
=-10.