问题
解答题
计算下列各式: (1)5
(2)(16
(3)5
(4)
(5)(7
(6)(7
(7)
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答案
(1)原式=10
-33
+23
=93
;3
(2)原式=8
-6
+5 2 2
-2 2
=6 3
-223 6 3
;2
(3)原式=5
(66
+123
)=302
+6018
=9012
+1202
;3
(4)原式=
×15
÷5 3
=5÷224
=6
;5 6 12
(5)原式=-((7
)2+(22
)2)=24-98=-74;6
(6)(21
-66
+24)÷6
=213
-62
+82
=153
+82
;3
(7)原式=2
+(a-b)a-b
-aa-b
=(2-b)a-b
.a-b