问题
解答题
计算: (1)3.75+(-4
(2)[15
|
答案
(1)3.75+(-4
)+1.625+(-25 8
)+(-53 4
)2 9
=(3.75-2.75)+(-4.625+1.625)-52 9
=1-3-52 9
=-7
;2 9
(2)[15
-(11 2
÷13 4
)-12 5
÷33 4
]÷(-11 2
)3 8
=[15
-1 2
-5 4
]÷(-1 2
)11 8
=
÷(-55 4
)11 8
=-10.