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计算(1)312+(-12)-(-13)+223(2)-82+3×(-2)2+(-6)÷(-13)2(3)412×[-9×(-13)2-0.8]÷(-514);(4)(512+23-34)×(-12)(5)-24-[(-3)2-(1-23×54)÷(-2)](6)(-96)×(-0.125)+96×18+

题目详情
计算
(1)3
1
2
+(-
1
2
)-(-
1
3
)+2
2
3

(2)-82+3×(-2)2+(-6)÷(-
1
3
2
(3)4
1
2
×[-9×(-
1
3
2-0.8]÷(-5
1
4
);
(4)(
5
12
+
2
3
-
3
4
)×(-12)
(5)-24-[(-3)2-(1-23×
5
4
)÷(-2)]
(6)(-96)×(-0.125)+96×
1
8
+(-96)×
5
4

(7)(3a-2)-3(a-5)
(8)(4a2b-5ab2)-(3a2b-4ab2
(9)x-2[y+2x-(3x-y)]
(10)
1
2
m-2(m-
1
3
n2)-(
3
2
m-
1
3
n2).
▼优质解答
答案和解析
(1)原式=3
1
2
-
1
2
+
1
3
+2
2
3
=3+3=6;
(2)原式=-64+3×4+(-6)÷
1
9
=-64+12+(-54)=-106;
(3)原式=
9
2
×(-9×
1
9
-0.8)÷(-
21
4
)=
9
2
×(-
9
5
)×(-
4
21
)=
54
35

(4)原式=
4
12
×(-12)=-4;
(5)原式=-16-[9-(1-8×
5
4
)÷(-2)]=-16-(9-
9
2
)=-25+
9
2
=-21
1
2

(6)原式=-96×(-
1
8
)+96×
1
8
-96×
5
4
=96×(
1
8
+
1
8
-
5
4
)=-96;
(7)原式=3a-2-3a+15=13;
(8)原式=4a2b-5ab2-3a2b+4ab2=a2b-ab2
(9)原式=x-2(y+2x-3x+y)=x-2(2y-x)=3x-4y;
(10)原式=
1
2
m-2m+
2
3
n2-
3
2
m+
1
3
n2=-3m+n2