一、计算题。(共30分)
1. 直接写出得数。(6分)
0.8 + 0.22 = 475 - 299 = 1÷$\frac{3}{10}$×$\frac{3}{5}$ = 0.8×99 + 0.8 =
6÷$\frac{3}{4}$ = 1÷20% = (16 + $\frac{1}{4}$)÷4 = $\frac{3}{4}$×$\frac{5}{6}$÷$\frac{5}{6}$×$\frac{3}{4}$ =
10 - 3.6 = 0.49÷0.7 = $\frac{3}{8}$ + $\frac{5}{8}$×$\frac{1}{5}$ = $\frac{5}{13}$÷7 + $\frac{9}{13}$×$\frac{1}{7}$ =
2. 解方程或解比例。(12分)
$\frac{0.36}{x}$ = $\frac{1}{4}$:0.75 $\frac{4}{9}$:$\frac{1}{6}$ = x:15 3×45 + 5x = 180
$\frac{5}{9}$ + $\frac{1}{4}$x = $\frac{2}{3}$ 18:(x - 1) = 2:7 x - 35%x = 0.52
3. 计算下面各题,能简算的要简算。(12分)
21.7 - $\frac{3}{7}$ + 7.3 - $\frac{11}{7}$ 3×(150 - 1530÷15) $\frac{15}{17}$×$\frac{5}{4}$ - $\frac{7}{17}$×1.25
$\frac{7}{12}$÷[($\frac{11}{6}$ - $\frac{4}{3}$)×14] ($\frac{2}{13}$ + $\frac{1}{37}$)×26 + $\frac{11}{37}$ 0.25×6.4×1.25
1. 直接写出得数。(6分)
0.8 + 0.22 = 475 - 299 = 1÷$\frac{3}{10}$×$\frac{3}{5}$ = 0.8×99 + 0.8 =
6÷$\frac{3}{4}$ = 1÷20% = (16 + $\frac{1}{4}$)÷4 = $\frac{3}{4}$×$\frac{5}{6}$÷$\frac{5}{6}$×$\frac{3}{4}$ =
10 - 3.6 = 0.49÷0.7 = $\frac{3}{8}$ + $\frac{5}{8}$×$\frac{1}{5}$ = $\frac{5}{13}$÷7 + $\frac{9}{13}$×$\frac{1}{7}$ =
2. 解方程或解比例。(12分)
$\frac{0.36}{x}$ = $\frac{1}{4}$:0.75 $\frac{4}{9}$:$\frac{1}{6}$ = x:15 3×45 + 5x = 180
$\frac{5}{9}$ + $\frac{1}{4}$x = $\frac{2}{3}$ 18:(x - 1) = 2:7 x - 35%x = 0.52
3. 计算下面各题,能简算的要简算。(12分)
21.7 - $\frac{3}{7}$ + 7.3 - $\frac{11}{7}$ 3×(150 - 1530÷15) $\frac{15}{17}$×$\frac{5}{4}$ - $\frac{7}{17}$×1.25
$\frac{7}{12}$÷[($\frac{11}{6}$ - $\frac{4}{3}$)×14] ($\frac{2}{13}$ + $\frac{1}{37}$)×26 + $\frac{11}{37}$ 0.25×6.4×1.25
答案:
1. 1.02 176 2 80 8 5 $4\frac{1}{16}$(或$\frac{65}{16}$) $\frac{9}{16}$ 6.4 0.7 $\frac{1}{2}$ $\frac{2}{13}$ 2. $x = 1.08$ $x = 40$ $x = 9$ $x = \frac{4}{9}$ $x = 64$ $x = 0.8$ 3. 27 144 $\frac{10}{17}$ $\frac{1}{12}$ 5 2
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