计算:(1)-5+6-7+8                            (2)-42×58-(-5)×0.25×(-4)3(3)(-3)×(-4)÷

计算:(1)-5+6-7+8                            (2)-42×58-(-5)×0.25×(-4)3(3)(-3)×(-4)÷

题型:解答题难度:一般来源:不详
计算:
(1)-5+6-7+8                            
(2)-42×
5
8
-(-5)×0.25×(-4)3
(3)(-3)×(-4)÷(-6)
(4)-
1
3
×(-3)2

(5)-1.53×0.75-0.53×(-
3
4

(6)-
3
4
-(1-0.5)÷
1
3
×[2+(-4)2].
答案
(1)原式=[(-5)+(-7)]+(6+8)=-12+14=2;
(2)原式=-16×
5
8
-(-5)×
1
4
×(-64)=-10-(-80)=-10+80=70;
(3)原式=12÷(-6)=-2;
(4)原式=-
1
3
×9=-3;
(5)原式=-1.53×0.75+0.53×0.75=0.75×(-1.53+0.53)=0.75;
(6)原式=-
3
4
-0.5×3×18=-
3
4
-27=-27
3
4
举一反三
计算:
(1)(-7)×(-5)-90÷(-15)
(2)
7
4
÷
7
8
-
2
3
×(-6)
题型:解答题难度:一般| 查看答案
计算
(1)1+(-2)+|-2-3|-5-(-9)
(2)
11
3
×(
1
3
-
1
2
3
11
÷
5
4

(3)(
5
12
+
2
3
-
3
4
)×(-12)

(4)0.25×(-2)3-[4÷(-
2
3
)2+1]+(-1)5
题型:解答题难度:一般| 查看答案
计算:
(1)3.75+(-4
5
8
)+1.625+(-2
3
4
)+(-5
2
9
)

(2)[15
1
2
-(1
3
4
÷1
2
5
)-1
3
4
÷3
1
2
]÷(-1
3
8
)
题型:解答题难度:一般| 查看答案
现规定一种运算a※b=ab+a-b,其中a,b为有理数,则3※5的结果为(  )
A.11B.12C.13D.14
题型:单选题难度:简单| 查看答案
先观察1-
1
22
=
1
2
×
3
2
1-
1
32
=
2
3
×
4
3
1-
1
42
=
3
4
×
5
4

(1)按上述规律填空:1-
1
1002
=______×______;1-
1
20102
=______×______.
(2)计算:(1-
1
22
)•(1-
1
32
)•(1-
1
42
)•…•(1-
1
20102
)
题型:解答题难度:一般| 查看答案
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