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1. $1.496× 10^{8}$这个数表示的原数为
149 600 000
.答案
149 600 000
2. 计算:
(1) $[(\dfrac{2}{3}-\dfrac{1}{2})÷\dfrac{1}{30}]×(-2×\dfrac{1}{10})$; (2) $18÷(-3)^2 - 6÷(-2)×(-\dfrac{1}{3})$;
(3) $6×3 - 6÷\dfrac{1}{6} - 6×(-1) + (-5)^2$; (4) $-1\dfrac{2}{3}÷\dfrac{3}{4}×(-0.6)×1\dfrac{3}{4}÷1.4×(-\dfrac{2}{5})$.
(1) $[(\dfrac{2}{3}-\dfrac{1}{2})÷\dfrac{1}{30}]×(-2×\dfrac{1}{10})$; (2) $18÷(-3)^2 - 6÷(-2)×(-\dfrac{1}{3})$;
(3) $6×3 - 6÷\dfrac{1}{6} - 6×(-1) + (-5)^2$; (4) $-1\dfrac{2}{3}÷\dfrac{3}{4}×(-0.6)×1\dfrac{3}{4}÷1.4×(-\dfrac{2}{5})$.
答案
(1)-1
(2)1
(3)13
(4)$-\dfrac{2}{3}$
(2)1
(3)13
(4)$-\dfrac{2}{3}$
3. 计算:
(1) $[2\dfrac{1}{2} - (\dfrac{3}{8} + \dfrac{1}{6} - \dfrac{3}{4}) × 24] ÷ 5 × (-1)^{99}$；
(2) $-2^5 ÷ (-4) × (\dfrac{1}{2})^2 - 12 × (-15 + 2^4)^3$；
(3) $-[(-1^{99}) ÷ (0.5 - \dfrac{1}{6})]^2 + [(\dfrac{3}{5} - \dfrac{1}{10}) ÷ 10\% + (-2)^2]$。
(1) $[2\dfrac{1}{2} - (\dfrac{3}{8} + \dfrac{1}{6} - \dfrac{3}{4}) × 24] ÷ 5 × (-1)^{99}$；
(2) $-2^5 ÷ (-4) × (\dfrac{1}{2})^2 - 12 × (-15 + 2^4)^3$；
(3) $-[(-1^{99}) ÷ (0.5 - \dfrac{1}{6})]^2 + [(\dfrac{3}{5} - \dfrac{1}{10}) ÷ 10\% + (-2)^2]$。
答案
(1)$-\dfrac{3}{2}$
(2)-10
(3)0
(2)-10
(3)0
