问题
解答题
计算:(1)-3+5.3+7-5.3; (2)(-2)×
(3)(
(4)-16-|-5|+2×(-
|
答案
(1)-3+5.3+7-5.3=(-3+7)+(5.3-5.3)=4;
(2)(-2)×
÷(-3 2
)×4=-3×(-3 4
)×4=16;4 3
(3)(
-1 3
+5 21
)×(-42)=3 14
×(-42)-1 3
×(-42)+5 21
×(-42)=(-14)-(-10)+(-9)=-13;3 14
(4)-16-|-5|+2×(-
)2=-1-5+2×1 2
=-51 4
;1 2