数学
-4
2
÷(-9a)×[(-5)×(-
3
90
)+(-9)].
计算:
(1)
4×(-
1
2
-
3
4
+2.5)×3
.
(2)(-1)
3
×(-12)÷[(-4)
2
+2×(-5)].
计算题
(1)1人-5÷(-2)+4×(-5)
(2)
-24×(
1
2
+
2
3
-
5
6
)+5
(3)
(-
5
5
)×(-4
)
2
-0.25×(-5)×(-4
)
3
(4)
-
3
2
÷[-
2
2
×(-
3
2
)
2
-(-2
)
3
]
.
The symbol(符号) 5!is called five factorial(阶乘)and means 5×4×3×2×1;Thus(因而)5!=120.How many 6!=?What is the result of
(n-1)!
n!
?Do you know 6!=
720
720
;
(n-1)!
n!
=
1
n
1
n
?.
计算:
(6)
(-
3
4
)-(-
6
m
)+(+
3
4
)+(-8.5)
(m)4-(-3)
m
×m.
计算:
(1)
[(
1
2
)
3
×(-2
)
3
]-(-
2
3
+
1
2
)÷(-2)
(2)
(-36)×(
5
4
-
5
6
-
11
12
)
.
计算:(-24)×(
1
8
-
1
3
+
1
4
)+(-3)
2
+|-4|+2
2
.
(-8)+(+9)-(-5)+(-3).
(
2
3
+
4
9
-
5
6
)×18
.
(
2
3
-
1
2
)÷(-
7
6
)×
14
5
.
-4
2
+(-20)÷(-5)-6×(-2)
3
.
计算:
(1)-12
1
3
-[10
1
3
+(-8
1
3
)-3
2
3
];(2)(-2)
3
-2
2
-|-
1
4
|×(-10)
2
.
计算
①-(3-5)+3
2
×(1-3)
②(-10)
3
+[(-4)
2
-(1-3
2
)×2].
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