题目内容
(1)
.
(2)3+50÷2×(-
)-1.
(3)25×
.
(4)[1-(1-0.5×
)]×[2-(-3)2].
(2)3+50÷2×(-
(3)25×
(4)[1-(1-0.5×
解:(1)原式=3
+2
﹣
﹣
﹣
=3
+2﹣
﹣
=3
+2﹣
=5;
(2)原式=3-50×
-1
=3-2
-1
=-
;
(3)原式=
+
﹣
=
+
=25;
(4)原式=[1-1+
] ×[2-9]
=
×(-7)
=-
.
=3
=3
=5;
(2)原式=3-50×
=3-2
=-
(3)原式=
=
=25;
(4)原式=[1-1+
=
=-
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