早教吧 育儿知识 作业答案 考试题库 百科 知识分享

化简计算(1)12-(-18)+(-7)-15(2)(23−1112−1415)×(−60)(3)5×(-2)-90÷(-15)(4)-112+13+16(5)(-3)2×4-(-2)3÷4(6)(-10)3+[(-4)2-(1-32)×2](7)(-2)3-2×(-3)+|2-5|-(-1

题目详情
化简计算
(1)12-(-18)+(-7)-15
(2)(
2
3
11
12
14
15
)×(−60)
(3)5×(-2)-90÷(-15 )        
(4)-1
1
2
+
1
3
+
1
6

(5)(-3)2×4-(-2)3÷4
(6)(-10)3+[(-4)2-(1-32)×2]
(7)(-2)3-2×(-3)+|2-5|-(-1)2010
(8)(−125
5
7
)÷(−5)−2.5÷
5
8
×(−
1
4
)
(9)3a2-2a-a2+5a
(10)-x2+y2-3xy-x2-y2
▼优质解答
答案和解析
(1)原式=12+18-7-15
=8;

(2)原式=
2
3
×(-60)-
11
12
×(-60)-
14
15
×(-60)
=-40+55+56
=71;

(3)原式=-10+6
=-4;

(4)原式=-
9
6
+
2
6
+
1
6

=-1;

(5)原式=9×4-(-8)÷4
=36+2
=38;

(6)原式=-1000+[16-(-8)×2]
=-1000+32
=968;

(7)原式=-8-2×(-3)+3-1
=-8+6+3-1
=0;

(8)原式=
176
7
+1
=
183
7

=26
1
7


(9)原式=(3-1)a2+(5-2)a
=2a2+3a;

(10)原式=-(1+1)x2+(1-1)y2-3xy
=-2x2-3xy.