1. 直接写得数。
$\frac{6}{7}×4.2=$ 4.2÷$\frac{1}{5}=$ 5×$\frac{1}{5}×0=$ 10 - 0.09 = $\frac{5}{16}×\frac{8}{15}=$
2.5×40%= 503 + 397 = $\frac{7}{9}-\frac{1}{3}=$ 8.1÷0.03 = 3.14×8 =
$\frac{6}{7}×4.2=$ 4.2÷$\frac{1}{5}=$ 5×$\frac{1}{5}×0=$ 10 - 0.09 = $\frac{5}{16}×\frac{8}{15}=$
2.5×40%= 503 + 397 = $\frac{7}{9}-\frac{1}{3}=$ 8.1÷0.03 = 3.14×8 =
答案:
3.6 21 0 9.91 $\frac{1}{6}$
@@1 900 $\frac{4}{9}$ 270 25.12
@@1 900 $\frac{4}{9}$ 270 25.12
2. 计算,能简算的要简算。
2.1 + 14.37 + 5.63 + 7.9 $\frac{2}{5}+\frac{5}{7}×(\frac{2}{3}-\frac{1}{5})$ 5.03 - [1.8×(3.25 - 2.75)]
20 - 2.2 - 7.8 7.5÷$\frac{1}{3}+7.5×7$ 25×26 - 356
320÷80 + 3.6×1.5 28×($\frac{2}{7}+\frac{3}{28}-\frac{5}{14}$) 87×$\frac{3}{85}$
2.1 + 14.37 + 5.63 + 7.9 $\frac{2}{5}+\frac{5}{7}×(\frac{2}{3}-\frac{1}{5})$ 5.03 - [1.8×(3.25 - 2.75)]
20 - 2.2 - 7.8 7.5÷$\frac{1}{3}+7.5×7$ 25×26 - 356
320÷80 + 3.6×1.5 28×($\frac{2}{7}+\frac{3}{28}-\frac{5}{14}$) 87×$\frac{3}{85}$
答案:
30 $\frac{11}{15}$ 4.13 10 75 294 9.4 1 $3\frac{6}{85}$
3. 解方程或比例。
6:3 = 12:$x$ 13$x$-7.5$x$ = 13.2 $\frac{12}{3}=\frac{x}{0.9}$
$x-\frac{3}{4}x = 8$ $\frac{3}{4}:x = 2:\frac{1}{6}$ $x:0.25 = 0.6:5$
$\frac{5}{6}:x=\frac{9}{10}:\frac{2}{3}$ $\frac{x}{6}=\frac{4}{3}:0.2$ $\frac{5}{8}:\frac{9}{10}=\frac{5}{9}:x$
6:3 = 12:$x$ 13$x$-7.5$x$ = 13.2 $\frac{12}{3}=\frac{x}{0.9}$
$x-\frac{3}{4}x = 8$ $\frac{3}{4}:x = 2:\frac{1}{6}$ $x:0.25 = 0.6:5$
$\frac{5}{6}:x=\frac{9}{10}:\frac{2}{3}$ $\frac{x}{6}=\frac{4}{3}:0.2$ $\frac{5}{8}:\frac{9}{10}=\frac{5}{9}:x$
答案:
$x = 6$ $x = 2.4$ $x = 3.6$ $x = 32$ $x = \frac{1}{16}$ $x = 0.03$ $x = \frac{50}{81}$ $x = 40$ $x = \frac{4}{5}$
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