《2025年黄冈小状元同步计算天天练六年级数学下册北师大版》

解下面的比例。
$1.5:1.2 = 7.5:x$          $40:x = 30:0.3$
$x:0.5=\frac{6}{5}:4$                  $x:0.4 = 20:0.5$
$x:(25 + 20)=8:6$          $\frac{1}{3}:1.2=(1 - \frac{1}{3}):x$
$(3.5 + 7):7 = 12:x$           $96:x = 6:(5.4 - 0.6)$

答案： 1.5:1.2 = 7.5:x
解:1.5x = 1.2×7.5
x = $\frac{1.2×7.5}{1.5}$
x = 6
40:x = 30:0.3
解:30x = 40×0.3
x = $\frac{40×0.3}{30}$
x = 0.4
x:0.5 = $\frac{6}{5}$:4
解:4x = 0.5×$\frac{6}{5}$
x = $\frac{0.5×\frac{6}{5}}{4}$
x = $\frac{3}{20}$
x:0.4 = 20:0.5
解:0.5x = 20×0.4
x = $\frac{20×0.4}{0.5}$
x = 16
x:(25 + 20) = 8:6
解:6x = 8×(25 + 20)
x = $\frac{8×45}{6}$
x = 60
$\frac{1}{3}$:1.2 = (1 - $\frac{1}{3}$):x
解:$\frac{1}{3}$x = 1.2×(1 - $\frac{1}{3}$)
x = $\frac{1.2×\frac{2}{3}}{\frac{1}{3}}$
x = 2.4
(3.5 + 7):7 = 12:x
解:10.5x = 7×12
x = $\frac{7×12}{10.5}$
x = 8
96:x = 6:(5.4 - 0.6)
解:6x = 96×4.8
x = $\frac{96×4.8}{6}$
x = 76.8