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