题目内容
计算题
(1)(2×102)×(3×103)
(2)-15+(
)2+(π-3)0.
(3)(2x)3-y3÷(16xy2)
(4)(x-1)(x2+x+1)
(1)(2×102)×(3×103)
(2)-15+(
| 1 |
| 2 |
(3)(2x)3-y3÷(16xy2)
(4)(x-1)(x2+x+1)
(1)(2×102)×(3×103),
=2×3×102+3,
=6×105;
(2)-15+(
)2+(π-3)0,
=-1+
+1,
=
;
(3)(2x)3•y3÷(16xy2),
=8x3•y3÷(16xy2),
=
x2y;
(4)(x-1)(x2+x+1),
=(x-1)(x2+x+1),
=x3+x2+x-x2-x-1,
=x3-1;
=2×3×102+3,
=6×105;
(2)-15+(
| 1 |
| 2 |
=-1+
| 1 |
| 4 |
=
| 1 |
| 4 |
(3)(2x)3•y3÷(16xy2),
=8x3•y3÷(16xy2),
=
| 1 |
| 2 |
(4)(x-1)(x2+x+1),
=(x-1)(x2+x+1),
=x3+x2+x-x2-x-1,
=x3-1;
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