计算与化简:(1)?30?(79+56?1112)×(?36); (2)?12011?[137+(?12)÷6]2×(?74)3; (3)5a2-[a2+(5a
计算与化简:(1)?30?(79+56?1112)×(?36);(2)?12011?[137+(?12)÷6]2×(?74)3;(3)5a2-[a2+(5a2-2a)-2...
计算与化简:(1)?30?(79+56?1112)×(?36); (2)?12011?[137+(?12)÷6]2×(?74)3; (3)5a2-[a2+(5a2-2a)-2(a2-3a)]; (4)若x、y满足|x+3y?1|+(y?23)2=0,求代数式12x?2(?x+13y2)+(?32x?13y2)的值.
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(1)?30?(
+
?
)×(?36)
=-30+28+30-33
=-5;
(2)?12011?[1
+(?12)÷6]2×(?
)3
=-1-[1
-2]2×(-
)
=-1-[-
]2×(-
)
=-1-
×(-
)
=-1+
=
;
(3)5a2-[a2+(5a2-2a)-2(a2-3a)]
=5a2-[a2+5a2-2a-2a2+6a]
=5a2-[4a2+4a]
=5a2-4a2-4a
=a2-4a;
(4)∵|x+3y?1|+(y?
)2=0,
∴
,
解得
7 |
9 |
5 |
6 |
11 |
12 |
=-30+28+30-33
=-5;
(2)?12011?[1
3 |
7 |
7 |
4 |
=-1-[1
3 |
7 |
343 |
64 |
=-1-[-
4 |
7 |
343 |
64 |
=-1-
16 |
49 |
343 |
64 |
=-1+
7 |
4 |
=
3 |
4 |
(3)5a2-[a2+(5a2-2a)-2(a2-3a)]
=5a2-[a2+5a2-2a-2a2+6a]
=5a2-[4a2+4a]
=5a2-4a2-4a
=a2-4a;
(4)∵|x+3y?1|+(y?
2 |
3 |
∴
|
解得
|