2026年亮点给力计算天天练六年级数学下册苏教版第21页答案
1. 直接写出得数。
$\frac{1}{5}÷\frac{4}{5}=$ $4.59 - 1.49 =$ $5×\frac{3}{10}=$ $1÷\frac{1}{6}×6=$
$6.3 + 2.1 =$ $3.3×0.3 =$ $0.38×40 =$ $0.72÷0.8×5 =$
$\frac{2}{9}×\frac{3}{8}=$ $0.36×\frac{5}{6}=$ $\frac{2}{13}÷\frac{2}{11}=$ $\frac{6}{5}×\frac{5}{3}×\frac{1}{2}=$
$0.7 - 0.35 =$ $360÷75\% =$ $2.48×0.7 =$ $210÷(1 - 30\%) =$
$\frac{7}{10}+\frac{2}{5}=$ $\frac{2}{17}÷\frac{3}{34}=$ $\frac{8}{9}×\frac{18}{5}=$ $\frac{3}{8}×16÷\frac{3}{8}×16 =$

答案

1. $\frac{1}{4}$ 3.1 $\frac{3}{2}$ 36 8.4 0.99 15.2 4.5 $\frac{1}{12}$ 0.3 $\frac{11}{13}$ 1 0.35 480 1.736 300 $\frac{11}{10}$ $\frac{4}{3}$ $\frac{16}{5}$ 256
2. 解方程。
$1.8 + 80\%x = 2$         $18x - 6.2×12 = 4.8$         $\frac{2}{3}x - 45\%x = 2.6$
$6x - \frac{5}{4} = \frac{5}{2}$         $\frac{4}{7}(8 - x) = \frac{32}{49}$         $5\%x + \frac{1}{8}×\frac{1}{6} = \frac{1}{3}$

答案

1. 解方程$1.8 + 80\%x = 2$:
解:
$80\%x = 2 - 1.8$
$0.8x = 0.2$
$x = 0.2÷0.8$
$x = 0.25$
2. 解方程$18x - 6.2×12 = 4.8$:
解:
$18x - 74.4 = 4.8$
$18x = 4.8 + 74.4$
$18x = 79.2$
$x = 79.2÷18$
$x = 4.4$
3. 解方程$\frac{2}{3}x - 45\%x = 2.6$:
解:
$\frac{2}{3}x-\frac{9}{20}x = 2.6$
$\frac{40}{60}x-\frac{27}{60}x = 2.6$
$\frac{13}{60}x = 2.6$
$x = 2.6÷\frac{13}{60}$
$x = 2.6×\frac{60}{13}$
$x = 12$
4. 解方程$6x - \frac{5}{4} = \frac{5}{2}$:
解:
$6x=\frac{5}{2}+\frac{5}{4}$
$6x=\frac{10}{4}+\frac{5}{4}$
$6x=\frac{15}{4}$
$x=\frac{15}{4}÷6$
$x=\frac{15}{4}×\frac{1}{6}$
$x=\frac{5}{8}$
5. 解方程$\frac{4}{7}(8 - x) = \frac{32}{49}$:
解:
$8 - x=\frac{32}{49}÷\frac{4}{7}$
$8 - x=\frac{32}{49}×\frac{7}{4}$
$8 - x=\frac{8}{7}$
$x = 8-\frac{8}{7}$
$x=\frac{56}{7}-\frac{8}{7}$
$x=\frac{48}{7}$
6. 解方程$5\%x + \frac{1}{8}×\frac{1}{6} = \frac{1}{3}$:
解:
$0.05x+\frac{1}{48}=\frac{1}{3}$
$0.05x=\frac{1}{3}-\frac{1}{48}$
$0.05x=\frac{16}{48}-\frac{1}{48}$
$0.05x=\frac{15}{48}$
$x=\frac{15}{48}÷0.05$
$x=\frac{15}{48}÷\frac{1}{20}$
$x=\frac{15}{48}×20$
$x=\frac{25}{4}$
计算:$(\frac{4}{11}×1\frac{1}{9}×\frac{4}{7})÷(\frac{2}{11}×\frac{5}{9}×\frac{2}{7})$。

答案

解:
$\begin{aligned}&(\frac{4}{11}×1\frac{1}{9}×\frac{4}{7})÷(\frac{2}{11}×\frac{5}{9}×\frac{2}{7})\\=&(\frac{4}{11}×\frac{10}{9}×\frac{4}{7})÷(\frac{2}{11}×\frac{5}{9}×\frac{2}{7})\\=&\frac{4}{11}÷\frac{2}{11}×\frac{10}{9}÷\frac{5}{9}×\frac{4}{7}÷\frac{2}{7}\\=&\frac{4}{11}×\frac{11}{2}×\frac{10}{9}×\frac{9}{5}×\frac{4}{7}×\frac{7}{2}\\=&4×2×2\\=&16\end{aligned}$
综上,答案为$16$。