能简算的要简算 (1) + - = (2) +( + )= (3) - + = (4) -( + )= (5) - -
1个回答
(1)原式=
-
=
(2)原式=
+
+
=1
(3)原式=
+
-
=2
(4)原式=
-
=
(5)原式=
-
=
(6)原式=
+
-(
+
)
=
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