3 计算题。
(1) $1=\frac{3}{( )}=\frac{( )}{18}=\frac{116}{( )}=\frac{( )}{( )}$
(2) $\frac{4}{15}+\frac{7}{15}=$
(3) $\frac{14}{22}-\frac{8}{22}=$
(4) $\frac{42}{57}+\frac{15}{57}=$
(5) $1-\frac{13}{36}=$
(6) $\frac{10}{100}-\frac{( )}{100}=\frac{3}{100}$
(7) $1-\frac{8}{65}-\frac{9}{65}-\frac{10}{65}=$
(1) $1=\frac{3}{( )}=\frac{( )}{18}=\frac{116}{( )}=\frac{( )}{( )}$
(2) $\frac{4}{15}+\frac{7}{15}=$
(3) $\frac{14}{22}-\frac{8}{22}=$
(4) $\frac{42}{57}+\frac{15}{57}=$
(5) $1-\frac{13}{36}=$
(6) $\frac{10}{100}-\frac{( )}{100}=\frac{3}{100}$
(7) $1-\frac{8}{65}-\frac{9}{65}-\frac{10}{65}=$
答案
(1) 3 18 116 略
(2) $\frac{11}{15}$
(3) $\frac{6}{22}$
(4) $\frac{57}{57}$或1
(5) $\frac{23}{36}$
(6) 7
(7) $\frac{38}{65}$
(2) $\frac{11}{15}$
(3) $\frac{6}{22}$
(4) $\frac{57}{57}$或1
(5) $\frac{23}{36}$
(6) 7
(7) $\frac{38}{65}$
4 列式计算。
(1)一个数比$\frac{8}{20}$多4个$\frac{1}{20}$,这个数是多少?
(2)从1里面减去3个$\frac{1}{8}$,差是多少?
(1)一个数比$\frac{8}{20}$多4个$\frac{1}{20}$,这个数是多少?
(2)从1里面减去3个$\frac{1}{8}$,差是多少?
答案
(1) $\frac{8}{20} + \frac{4}{20} = \frac{12}{20}$
(2) $1 - \frac{3}{8} = \frac{5}{8}$
(2) $1 - \frac{3}{8} = \frac{5}{8}$
5 算一算。
(1) $\frac{12}{15} - \frac{5}{16} + \frac{3}{15}$
(2) $\frac{7}{10} + \frac{3}{10} - \frac{1}{2}$
(3) $3 + \frac{1}{4} + \frac{3}{4}$
(4) $5 - \frac{1}{4} - \frac{3}{4}$
(1) $\frac{12}{15} - \frac{5}{16} + \frac{3}{15}$
(2) $\frac{7}{10} + \frac{3}{10} - \frac{1}{2}$
(3) $3 + \frac{1}{4} + \frac{3}{4}$
(4) $5 - \frac{1}{4} - \frac{3}{4}$
答案
(1) $\frac{11}{16}$
(2) $\frac{1}{2}$
(3) 4
(4) 4
(2) $\frac{1}{2}$
(3) 4
(4) 4
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