《2025年口算训练五年级数学上册人教版双色升级版》

$1.82 - 0.63 =$
$9.2 ÷ 0.01 =$
$3.07 × 0.2 =$
$32.8 + 19 =$
$6 - 5.46 =$
$0.56 ÷ 0.07 =$
$40.6 ÷ 2 =$
$0.5 ÷ 0.1 =$
$14 × 0.4 =$
$0.75 ÷ 3 =$
$5.4 ÷ 0.6 =$
$3.2 - 0.8 =$
$1.8 + 5.6 =$
$0.42 × 0.5 =$
$0.67 + 1.24 =$
$5.2 ÷ 1.3 =$
$1.6 × 0.5 =$
$0.51 ÷ 0.17 =$
$13.5 + 6.05 =$
$0.6 - 0.37 =$
$0.078 ÷ 0.1 =$

答案： 解析：这些题目都是基础的小数加减乘除运算，考查学生对小数运算的掌握程度。
答案：
$1.19$
$920$
$0.614$
$51.8$
$0.54$
$8$
$20.3$
$5$
$5.6$
$0.25$
$9$
$2.4$
$7.4$
$0.21$
$1.91$
$4$
$0.8$
$3$
$19.55$
$0.23$
$0.78$

直接写出$x$的值。
$3(x - 2.1) = 9$
$x =$
$x + 3.5x = 9$
$x =$
$15x - 8x = 8.4$
$x =$
$9x + 11x = 0.4$
$x =$
$8x + 3x = 3.3$
$x =$
$(x - 5) ÷ 6 = 1.6$
$x =$
$3.1x + 1.9x = 25$
$x =$
$4(x - 3.5) = 24$
$x =$
$0.96 + 4x = 10.96$
$x =$
$7(x - 4) = 4.2$
$x =$

答案： 解析：这些题目都是一元一次方程的求解问题，需要通过移项、合并同类项、除法等操作求解未知数 $x$。
答案：
$3(x - 2.1) = 9$
解：$3x - 6.3 = 9$
$3x = 15.3$
$x = 5.1$
$x + 3.5x = 9$
解：$4.5x = 9$
$x = 2$
$15x - 8x = 8.4$
解：$7x = 8.4$
$x = 1.2$
$9x + 11x = 0.4$
解：$20x = 0.4$
$x = 0.02$
$8x + 3x = 3.3$
解：$11x = 3.3$
$x = 0.3$
$(x - 5) ÷ 6 = 1.6$
解：$x - 5 = 9.6$
$x = 14.6$
$3.1x + 1.9x = 25$
解：$5x = 25$
$x = 5$
$4(x - 3.5) = 24$
解：$4x - 14 = 24$
$4x = 38$
$x = 9.5$
$0.96 + 4x = 10.96$
解：$4x = 10$
$x = 2.5$
$7(x - 4) = 4.2$
解：$7x - 28 = 4.2$
$7x = 32.2$
$x = 4.6$

直接写出$x$的值。
$6(x + 1.2) = 18.6$
$x =$
$7(x + 1.2) = 8.4$
$x =$
$7x + 2x = 8.1$
$x =$
$(x - 4) ÷ 2 = 12$
$x =$
$9x - 3x = 7.2$
$x =$
$6x + 2x = 6.4$
$x =$
$5x + 4x = 63$
$x =$
$5(x + 2.1) = 75$
$x =$
$21.6x - 12.6x = 0.27$
$x =$
$18x - 7x = 121$
$x =$

答案： 解析：这些题目都是基础的一元一次方程，需要通过移项、合并同类项、除法等操作求解。
答案：
$6(x + 1.2) = 18.6$
$x + 1.2 = \frac{18.6}{6}$
$x + 1.2 = 3.1$
$x = 3.1 - 1.2$
$x = 1.9$
$7(x + 1.2) = 8.4$
$x + 1.2 = \frac{8.4}{7}$
$x + 1.2 = 1.2$
$x = 1.2 - 1.2$
$x = 0$
$7x + 2x = 8.1$
$9x = 8.1$
$x = \frac{8.1}{9}$
$x = 0.9$
$(x - 4) ÷ 2 = 12$
$x - 4 = 12 × 2$
$x - 4 = 24$
$x = 24 + 4$
$x = 28$
$9x - 3x = 7.2$
$6x = 7.2$
$x = \frac{7.2}{6}$
$x = 1.2$
$6x + 2x = 6.4$
$8x = 6.4$
$x = \frac{6.4}{8}$
$x = 0.8$
$5x + 4x = 63$
$9x = 63$
$x = \frac{63}{9}$
$x = 7$
$5(x + 2.1) = 75$
$x + 2.1 = \frac{75}{5}$
$x + 2.1 = 15$
$x = 15 - 2.1$
$x = 12.9$
$21.6x - 12.6x = 0.27$
$9x = 0.27$
$x = \frac{0.27}{9}$
$x = 0.03$
$18x - 7x = 121$
$11x = 121$
$x = \frac{121}{11}$
$x = 11$