2026年亮点给力提优课时作业本五年级数学下册苏教版江苏专版第1页解析答案

1. 解方程。（12 分）
$6x + 6 = 306$ $x - 0.1x = 1.08$ $2x - 3.5 + 4.5 = 12$
$0.3x + 1.2×3 = 10.5$ $4.8x÷0.5 = 7.2$ $(x + 6)×0.25 = 4$

答案：1. $ x = 50 $ $ x = 1.2 $ $ x = 5.5 $ $ x = 23 $ $ x = 0.75 $ $ x = 10 $

解析：

解：$6x + 6 = 306$
$6x = 306 - 6$
$6x = 300$
$x = 300÷6$
$x = 50$
$x - 0.1x = 1.08$
$0.9x = 1.08$
$x = 1.08÷0.9$
$x = 1.2$
$2x - 3.5 + 4.5 = 12$
$2x + 1 = 12$
$2x = 12 - 1$
$2x = 11$
$x = 11÷2$
$x = 5.5$
$0.3x + 1.2×3 = 10.5$
$0.3x + 3.6 = 10.5$
$0.3x = 10.5 - 3.6$
$0.3x = 6.9$
$x = 6.9÷0.3$
$x = 23$
$4.8x÷0.5 = 7.2$
$4.8x = 7.2×0.5$
$4.8x = 3.6$
$x = 3.6÷4.8$
$x = 0.75$
$(x + 6)×0.25 = 4$
$x + 6 = 4÷0.25$
$x + 6 = 16$
$x = 16 - 6$
$x = 10$

2. 看图列方程解答。（12 分）
(1)

(2)

(3)

(4)

答案：2. (1) $ 18x = 450 $ $ x = 25 $ (2) $ 3x + 450 = 1050 $ $ x = 200 $ (3) $ 25×4 + 5x = 150 $ $ x = 10 $ (4) $ 4x + 3x = 420 $ $ x = 60 $

解析：

(1) $18x = 450$
$x = 25$
(2) $3x + 450 = 1050$
$3x = 600$
$x = 200$
(3) $25×4 + 5x = 150$
$100 + 5x = 150$
$5x = 50$
$x = 10$
(4) $4x + 3x = 420$
$7x = 420$
$x = 60$