加減混合計(jì)算題:
(1)15-(+5
5
6
)-(+3
3
7
)+(-2
1
6
)-(+6
4
7
)  
(2)(-1.5)+(+3
1
4
)+(+3.75)+(-4
1
2

(3)(-5
2
3
)-(+
1
4
)+(-
1
3
)+(+5)-(-1
1
4
) 
(4)4
2
13
+8-(+3
2
13
)+(-1
2
5
)+(-2
3
5

(5)(-3
2
3
)-(-2
3
4
)-(-1
2
3
)-(+1.75)
(6)(-4
7
8
)-(-5
1
2
)+(-4
1
4
)-(3
1
8

(7)(-1
1
2
)+(+1
1
4
)+(-2
1
2
)-(-3
3
4
)-(+1
1
4

(8)(-1.2+2
1
6
)-(-5
5
6
)-|-3.4-(-1.2)|
(9)
1
1×2
+
1
2×3
+…+
1
8×9
+
1
9×10
     
(10)
1
1×3
+
1
3×5
+…+
1
97×99
+
1
99×101
分析:(1)原式去括號(hào)后結(jié)合,計(jì)算即可得到結(jié)果;
(2)原式結(jié)合后,相加即可得到結(jié)果;
(3)原式利用減法法則變形,相加即可得到結(jié)果;
(4)原式結(jié)合后,利用加法法則計(jì)算即可得到結(jié)果;
(5)原式利用減法法則變形,相加即可得到結(jié)果;
(6)原式利用減法法則變形,計(jì)算即可得到結(jié)果;
(7)原式利用減法法則變形,結(jié)合后計(jì)算即可得到結(jié)果;
(8)原式利用減法法則及絕對(duì)值的代數(shù)意義化簡,計(jì)算即可得到結(jié)果;
(9)原式拆項(xiàng)后,抵消即可得到結(jié)果;
(10)原式拆項(xiàng)后,抵消即可得到結(jié)果.
解答:解:(1)原式=15+(-5
5
6
-2
1
6
)+(-3
3
7
-6
4
7

=15-8-10
=-3;

(2)原式=(-1.5-4.5)+(3.25+3.75)
=-6+7
=1;

(3)原式=(-5
2
3
-
1
3
)+(-
1
4
+1
1
4
)+5
=-6+1+6
=0;

(4)原式=(4
2
13
-3
2
13
)+(-1
2
5
-2
3
5
)+8
=1-4+8
=5;

(5)原式=(-3
2
3
+1
2
3
)+(2.75-1.75)
=-2+1
=-1;

(6)原式=(-4
7
8
-3
1
8
)+(5
1
2
-4
1
4

=-8+1
1
4

=-6
3
4
;

(7)原式=(-1
1
2
-2
1
2
)+(1
1
4
+3
3
4
-1
1
4

=-4+3
3
4

=-
1
4
;

(8)原式=-1.2+(2
1
6
+5
5
6
)-|-3.4+1.2|
=-1.2+8-2.2
=-4.6;

(9)原式=1-
1
2
+
1
2
-
1
3
+…+
1
9
-
1
10

=1-
1
10

=
9
10
;

(10)原式=
1
2
×(1-
1
3
+
1
3
-
1
5
+…+
1
99
-
1
101

=
1
2
×(1-
1
101

=
50
101
點(diǎn)評(píng):此題考查了有理數(shù)的加減混合運(yùn)算,熟練掌握運(yùn)算法則是解本題的關(guān)鍵.
練習(xí)冊系列答案
相關(guān)習(xí)題

科目:初中數(shù)學(xué) 來源: 題型:

加減混合計(jì)算題:
(1)4+5-11;       
(2)24-(-16)+(-25)-15;          
(3)-7.2+3.9-8.4+12;
(4)-3-5+7;        
(5)-26+43-34+17-48;        
(6)91.26-293+8.74+191;
(7)12-(-18)+(-7)-15;               
(8)(-40)-(+28)-(-19)+(-24)-(32);
(9)(+4.7)-(-8.9)-(+7.5)+(-6);
(10)-6-8-2+3.54-4.72+16.46-5.28.

查看答案和解析>>

科目:初中數(shù)學(xué) 來源: 題型:解答題

加減混合計(jì)算題:
(1)4+5-11;       
(2)24-(-16)+(-25)-15;          
(3)-7.2+3.9-8.4+12;
(4)-3-5+7;        
(5)-26+43-34+17-48;        
(6)91.26-293+8.74+191;
(7)12-(-18)+(-7)-15;               
(8)(-40)-(+28)-(-19)+(-24)-(32);
(9)(+4.7)-(-8.9)-(+7.5)+(-6);
(10)-6-8-2+3.54-4.72+16.46-5.28.

查看答案和解析>>

同步練習(xí)冊答案