计算:(1)-8-(-14)+(-9-12)(2)x-[3x-2(y+2x)+5y](3)[(?1)3?(712?34)×(?36)]÷|?(32)2+12
计算:(1)-8-(-14)+(-9-12)(2)x-[3x-2(y+2x)+5y](3)[(?1)3?(712?34)×(?36)]÷|?(32)2+12|...
计算:(1)-8-(-14)+(-9-12)(2)x-[3x-2(y+2x)+5y](3)[(?1)3?(712?34)×(?36)]÷|?(32)2+12|
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(1)-8-(-14)+(-9-12)
=-8+14-9-12
=[(-8)+(-9)+(-12)]+14
=(-29)+14
=-(29-14)
=-15;
(2)x-[3x-2(y+2x)+5y]
=x-[3x-(2y+4x)+5y]
=x-(3x-2y-4x+5y)
=x-(-x+3y)
=x+x-3y
=2x-3y;
(3)[(?1)3?(
?
)×(?36)]÷|?(
)2+
|
=[-1-
×(-36)+
×(-36)]÷|-
+
|
=(-1+21-27)÷
=-7×
=-4.
=-8+14-9-12
=[(-8)+(-9)+(-12)]+14
=(-29)+14
=-(29-14)
=-15;
(2)x-[3x-2(y+2x)+5y]
=x-[3x-(2y+4x)+5y]
=x-(3x-2y-4x+5y)
=x-(-x+3y)
=x+x-3y
=2x-3y;
(3)[(?1)3?(
7 |
12 |
3 |
4 |
3 |
2 |
1 |
2 |
=[-1-
7 |
12 |
3 |
4 |
9 |
4 |
2 |
4 |
=(-1+21-27)÷
7 |
4 |
=-7×
4 |
7 |
=-4.
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