2025年能力培养与测试五年级数学上册人教版第67页答案
1. 解方程。
$25 - 8x = 9$
$4x + 4×8 = 36$
$3.2x - 1.2 = 45.2$
$18 + 2x = 81.6$

答案

1.x=2 x=1 x=14.5 x=31.8

解析

解:$25 - 8x = 9$
$8x = 25 - 9$
$8x = 16$
$x = 2$
$4x + 4×8 = 36$
$4x + 32 = 36$
$4x = 36 - 32$
$4x = 4$
$x = 1$
$3.2x - 1.2 = 45.2$
$3.2x = 45.2 + 1.2$
$3.2x = 46.4$
$x = 14.5$
$18 + 2x = 81.6$
$2x = 81.6 - 18$
$2x = 63.6$
$x = 31.8$
2. 看图列出方程,并解答。
(1)

(2)

答案

2.
(1)4x-64=800 x=216
(2)3x+3=39 x=12