问题
解答题
计算 (1)3
(2)(
(3)1
|
答案
(1)3
-(24 9
-211 17
)5 9
=3
+24 9
-25 9 11 17
=6-211 17
=3
;6 17
(2)(
+2 3
×7 9
)÷9 28 11 12
=(
+2 3
)÷1 4 11 12
=
×11 12 12 11
=1;
(3)1
×[72 3
÷(14.625-35 6
)-41 8
]1 3
=1
×[72 3
÷11.5-45 6
]1 3
=1
×[2 3
×47 6
-42 23
]1 3
=1
×[2 3
-447 69
]1 3
=
×(-5 3
)252 69
=-
.140 23