解:设欧州面积为x方程 $$ x+ \frac{9}{10}x=1900 \\ \frac{19}{10}x=1900 \\ \frac{19}{10}x \div \frac{19}{10}=1900 \div \frac{19}{10} \\ x=1900 \times \frac{10}{19} \\ x=1000 $$ 千米账洋州面积为½{1}{10}x方平方 千米 $$ 1900-1000=900万平方千米 $$ 4. ...
.把1米平均分成10份,其中的7份用小数表示是(0.7)米。4.1980年的2月有(29)天,1900年的全年有(365)天,国庆节在第(四)季度,这一季度有(92)天。900).$$ \Delta \div 6=(5)。 $$5.如果$$ 7 0 \times 3 = 9 0 $$,那么$$ \Delta \times 30=(900) $$ 5)。6.请仔细阅读下面的材料,并...
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$\text{km}$(千米) $210$ ; $2.1\times {{10}^{9}}$ 【解析】 (900mL=900)* 1(0^(-3))(()^3)=0.9(()^3). 0.5(()^3)=500(()^3)=5* ((10)^5)(mL). 3(.6km=360)0. 2(.1m=210cm)=2.1* ((10)^9)(nm).反馈...
计算(1)$1吨-700\mathrm{千克}=$ (2)$3500\mathrm{千克}+1500\mathrm{千克}=$ (3)$2\mathrm{千米}-400米=$ (4)$1900米-900米=$ (5)$2300\mathrm{千克}+1700\mathrm{千克}=$ (6)$230-40\times 5=$ 答案 解: 1吨-700千克=1000千克-700千克=300千克 【知识点】「质量单位的认识、进...
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Also don’t leave anything on your cars , they’ll break in and take whatever is in there, happend to me 3 times in the last 2 years. " 0 Flag Irving V. Resident 6y ago "tgis is a nice area, its close to everything but I'm not used to living in this area. it's not ...