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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)(
−
−
)×(−60)
(3)5×(-2)-90÷(-15 )
(4)-1
+
+
(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)−2.5÷
×(−
)
(9)3a2-2a-a2+5a
(10)-x2+y2-3xy-x2-y2.
(1)12-(-18)+(-7)-15
(2)(
2 |
3 |
11 |
12 |
14 |
15 |
(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 |
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=
×(-60)-
×(-60)-
×(-60)
=-40+55+56
=71;
(3)原式=-10+6
=-4;
(4)原式=-
+
+
=-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=
+1
=
=26
;
(9)原式=(3-1)a2+(5-2)a
=2a2+3a;
(10)原式=-(1+1)x2+(1-1)y2-3xy
=-2x2-3xy.
=8;
(2)原式=
2 |
3 |
11 |
12 |
14 |
15 |
=-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 |
=
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.
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