题目内容
(1)-22-(-3)3×(-1)4-(-1)5
(2)-48×(
-
+
-
)
(3)-14-
×[2-(-3)2]
(4)(x2+2xy+y2)-(x2-xy+y2)
(5)9a2-[7a2-2a-2(a2-3a)]-3
(6)化简求值,2(a2b+3ab2)-3(a2b-1)-2a2b-2,其中a=-2,b=2.
(2)-48×(
| 1 |
| 2 |
| 5 |
| 8 |
| 1 |
| 3 |
| 11 |
| 16 |
(3)-14-
| 1 |
| 6 |
(4)(x2+2xy+y2)-(x2-xy+y2)
(5)9a2-[7a2-2a-2(a2-3a)]-3
(6)化简求值,2(a2b+3ab2)-3(a2b-1)-2a2b-2,其中a=-2,b=2.
(1)原式=-4-(-27)×1-(-1)
=-4+27+1
=24;
(2)原式=-48×
-48×(-
)-48×
-48×(-
)
=-24+30-16
=-10;
(3)原式=-1-
×(2-9)
=-1+
=
;
(4)原式=x2+2xy+y2-x2+xy-y2
=3xy;
(5)原式=9a2-(7a2-2a-2a2+6a)-3
=9a2-7a2+2a+2a2-6a-3
=4a2-4a-3;
(6)原式=2a2b+6ab2-3a2b+3-2a2b-2
=6ab2-3a2b+1,
当a=-2,b=2时,原式=6×(-2)×22-3×(-2)2×2+1=-48-24+1=-72+1=-71.
=-4+27+1
=24;
(2)原式=-48×
| 1 |
| 2 |
| 5 |
| 8 |
| 1 |
| 3 |
| 11 |
| 16 |
=-24+30-16
=-10;
(3)原式=-1-
| 1 |
| 6 |
=-1+
| 7 |
| 6 |
=
| 1 |
| 6 |
(4)原式=x2+2xy+y2-x2+xy-y2
=3xy;
(5)原式=9a2-(7a2-2a-2a2+6a)-3
=9a2-7a2+2a+2a2-6a-3
=4a2-4a-3;
(6)原式=2a2b+6ab2-3a2b+3-2a2b-2
=6ab2-3a2b+1,
当a=-2,b=2时,原式=6×(-2)×22-3×(-2)2×2+1=-48-24+1=-72+1=-71.
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有理数-22,(-2)3,-|-2|,-(-
)中,负数有( )
| 1 |
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