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