第21页 - 江苏版实验班提优训练数学六年级上下册答案

D

C

80

0.86

$\frac{7}{12}$

0.7

3

4

=915-45

=870

=6.5×(4.8+15.2)

=6.5×20

=130

$=\frac{17}{10}-(\frac16+\frac{3}{4}×\frac{14}{15})$

$=\frac{17}{10}-(\frac{1}{6}+\frac{7}{10})$

$=\frac{17}{10}-\frac{7}{10}-\frac16$

$=1-\frac16$

$=\frac{5}{6}$

$ \begin{aligned}解：4x&=58+234 \\ 4x&=292 \\ x&=73 \\ \end{aligned}$

$ \begin{aligned}解：\frac35x+\frac13x&=\frac{7}{20} \\ \frac{14}{15}x&=\frac{7}{20} \\ x&=\frac{7}{20}÷\frac{14}{15} \\ x&=\frac38 \\ \end{aligned}$

$ \begin{aligned} 解：0.2&=\frac{4}{25}x \\ x&=0.2÷\frac{4}{25} \\ x&=0.2×\frac{25}{4} \\ x&=1.25 \\ \end{aligned}$