解: \dfrac {4}{3}: \dfrac {8}{9} = \dfrac {4}{3}÷ \dfrac {8}{9} = \dfrac {4}{3}× \dfrac {9}{8} = \dfrac {3}{2} =1 \dfrac {1}{2}; 故选:C.依据比与除法的联系,用比的前项除以后项得到的数就是它们的比值,据此即可求解. 解答此题要注意:求比值结...
解:(1)如果\dfrac{8}{9}a=\dfrac{3}{4}b,则有a:b=\dfrac{3}{4}:\dfrac{8}{9}=27:32;(2)因为a:b=27:32,可得a:b=\dfrac{27}{32}(一定),是a和b对应的“比值”一定,所以a和b成正比例关系;故答案为:27,32,正.(1)把等式\dfrac{8}{9}a=\dfrac{3}{4}b,改写成一个外...
列式计算:(1) \dfrac {8}{9}的 \dfrac {3}{4}是多少?(2)120千米的 \dfrac {7}{45}是多少千米?(3)32个苹果的 \dfr
解:根据已知条件甲数\dfrac{2}{3}的等于乙数的\dfrac{3}{4},即甲数×\dfrac{2}{3}=乙数×\dfrac{3}{4},根据等式的性质原式转化为:甲数=乙数×\dfrac{3}{4}×\dfrac{3}{2},即甲数=乙数×\dfrac{9}{8}由此可以判断甲数=乙数的×\dfrac{9}{8}。故答案为:√。要判断甲、乙两数...
分数加减混合运算.(1)\dfrac{9}{4}+\dfrac{8}{8}+\dfrac{1}{3}=(2)\dfrac{8}{6}-\dfrac{3}{7}+\dfra
等比数列2,\dfrac{4}{3},\dfrac{8}{9},\cdots 的公比为 ;第5项为 . 相关知识点: 试题来源: 解析 \dfrac{2}{3};\dfrac{32}{81} q=\dfrac{\dfrac{4}{3}}{2}=\dfrac{2}{3},{{a}_{5}}={{a}_{1}}{{q}^{4}}=2\times {{\left( \dfrac{2}{3} \right)}^{4}}=\df...
已知f(x)的值域为[ \dfrac {3}{8}, \dfrac {4}{9}],则函数y=f(x)+ \sqrt {1-2f(x)}的值域为( ) A. A.&nb
___ 的4倍是 \dfrac {4}{9}; \dfrac {3}{8}是 ___ 的2倍; ___ 的10倍是 \dfrac {1}{10}.
x+\dfrac{3}{4}=\dfrac{7}{8} x=\dfrac{7}{8}-\dfrac{3}{4} x=\dfrac{7}{8}-\dfrac{6}{8} x=\dfrac{1}{8} (2) x+\dfrac{1}{8}=\dfrac{9}{8} x=\dfrac{9}{8}-\dfrac{1}{8} x=1 (3) \dfrac{11}{12}-x=\dfrac{5}{6} x=\dfrac{11}{12}-\dfrac{...
解析 ( 1 ) 1 3= (1* 3) (3* 3)= 3 9 ( 2 ) 5 6= (5* 5) (6* 5)= (25) (30) 4 5= (4* 6) (5* 6)= (24) (30) ( 3 ) 8 9= (8* 4) (9* 4)= (32) (36) (11) (12)= (11* 3) (12* 3)= (33) (36)反馈...