《2025年云南省标准教辅同步指导训练与检测配套测试卷五年级数学上册人教版》

4. 解方程。(每题 2 分,共 18 分)
$x - 54.3 = 100$ $(x + 5)÷3 = 16$
$48 - 27 + 5x = 31$ $x + 3.7x = 16.1 - 2$
$3x÷5.4 = 1.2$ $6x + 15×7 = 141$
$8.5x - 2.5x = 0.72$ $(x - 3.8)÷5 = 13$
$2x + 0.74 = 1.26$

答案： 1. $x - 54.3 = 100$
解：$x = 100 + 54.3$
$x = 154.3$
2. $(x + 5)÷3 = 16$
解：$x + 5 = 16 × 3$
$x + 5 = 48$
$x = 48 - 5$
$x = 43$
3. $48 - 27 + 5x = 31$
解：$21 + 5x = 31$
$5x = 31 - 21$
$5x = 10$
$x = 10 ÷ 5$
$x = 2$
4. $x + 3.7x = 16.1 - 2$
解：$4.7x = 14.1$
$x = 14.1 ÷ 4.7$
$x = 3$
5. $3x÷5.4 = 1.2$
解：$3x = 1.2 × 5.4$
$3x = 6.48$
$x = 6.48 ÷ 3$
$x = 2.16$
6. $6x + 15×7 = 141$
解：$6x + 105 = 141$
$6x = 141 - 105$
$6x = 36$
$x = 36 ÷ 6$
$x = 6$
7. $8.5x - 2.5x = 0.72$
解：$6x = 0.72$
$x = 0.72 ÷ 6$
$x = 0.12$
8. $(x - 3.8)÷5 = 13$
解：$x - 3.8 = 13 × 5$
$x - 3.8 = 65$
$x = 65 + 3.8$
$x = 68.8$
9. $2x + 0.74 = 1.26$
解：$2x = 1.26 - 0.74$
$2x = 0.52$
$x = 0.52 ÷ 2$
$x = 0.26$