1.每日速算。
$4.6+5.4=$
$\frac {3}{10}+\frac {11}{20}=$
$4.6+5.4=$
10
$2-1.2=$0.8
$3.6×0.3=$1.08
$32.8÷8=$4.1
$\frac {3}{10}+\frac {11}{20}=$
$\frac{17}{20}$
$1\frac {1}{5}-\frac {3}{10}=$$\frac{9}{10}$
$\frac {5}{11}+\frac {3}{11}+\frac {4}{11}=$$1\frac{1}{11}$
$1-\frac {2}{9}-\frac {5}{9}=$$\frac{2}{9}$
答案:
$4.6+5.4=10$
$2-1.2=0.8$
$3.6×0.3=1.08$
$32.8÷8=4.1$
$\frac {3}{10}+\frac {11}{20}=\frac{6}{20}+\frac{11}{20}=\frac{17}{20}$
$1\frac {1}{5}-\frac {3}{10}=\frac{6}{5}-\frac{3}{10}=\frac{12}{10}-\frac{3}{10}=\frac{9}{10}$
$\frac {5}{11}+\frac {3}{11}+\frac {4}{11}=\frac{5+3+4}{11}=\frac{12}{11}=1\frac{1}{11}$
$1-\frac {2}{9}-\frac {5}{9}=1-(\frac{2}{9}+\frac{5}{9})=1-\frac{7}{9}=\frac{2}{9}$
$2-1.2=0.8$
$3.6×0.3=1.08$
$32.8÷8=4.1$
$\frac {3}{10}+\frac {11}{20}=\frac{6}{20}+\frac{11}{20}=\frac{17}{20}$
$1\frac {1}{5}-\frac {3}{10}=\frac{6}{5}-\frac{3}{10}=\frac{12}{10}-\frac{3}{10}=\frac{9}{10}$
$\frac {5}{11}+\frac {3}{11}+\frac {4}{11}=\frac{5+3+4}{11}=\frac{12}{11}=1\frac{1}{11}$
$1-\frac {2}{9}-\frac {5}{9}=1-(\frac{2}{9}+\frac{5}{9})=1-\frac{7}{9}=\frac{2}{9}$
2.解方程。
$x+\frac {1}{4}= 3$ $x-\frac {5}{12}= \frac {3}{8}$ $x÷1.3= 5$
$x+\frac {1}{4}= 3$ $x-\frac {5}{12}= \frac {3}{8}$ $x÷1.3= 5$
答案:
解:
$x+\frac{1}{4}=3$
$x=3-\frac{1}{4}$
$x=2\frac{3}{4}$
$x-\frac{5}{12}=\frac{3}{8}$
$x=\frac{3}{8}+\frac{5}{12}$
$x=\frac{9}{24}+\frac{10}{24}$
$x=\frac{19}{24}$
$x÷1.3=5$
$x=5×1.3$
$x=6.5$
$x+\frac{1}{4}=3$
$x=3-\frac{1}{4}$
$x=2\frac{3}{4}$
$x-\frac{5}{12}=\frac{3}{8}$
$x=\frac{3}{8}+\frac{5}{12}$
$x=\frac{9}{24}+\frac{10}{24}$
$x=\frac{19}{24}$
$x÷1.3=5$
$x=5×1.3$
$x=6.5$
3.看图列方程,并求出方程的解。
(1)


(2)
(1)
(2)
答案:
(1) 解:$x + 5.3 = 6.2$
$x = 6.2 - 5.3$
$x = 0.9$
(2) 解:$2x + 67 = 187$
$2x = 187 - 67$
$2x = 120$
$x = 60$
(1) 解:$x + 5.3 = 6.2$
$x = 6.2 - 5.3$
$x = 0.9$
(2) 解:$2x + 67 = 187$
$2x = 187 - 67$
$2x = 120$
$x = 60$
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