《2025年通城学典计算能手四年级数学下册青岛版》

 一、解方程

$x + 2 - 2.6 = 3.22$
$7x - 2.5x = 13.5$
$7 + 4.2x = 11.2$
$7.5÷2.5 + x = 10.2$
$15x - 5×4 = 85$
$5.6x - 3.9x = 54.4$
$x÷(18 + 7) = 6$
$7.5x + x = 31.45$
$13×(x + 5) = 169$
$6×0.4 + 2x = 9.6$
$5.7x÷4 = 34.2$
$x÷(20 - 10.5) = 41.8$
$4.7 + 3x = 7.4$
$(x - 7)÷5 = 57.6$
$(2x - 1.8)×3 = 13.8$

答案： x = 3.82 x = 3x = 1x = 7.2 x = 7x = 32x = 150 x = 3.7x = 8x = 3.6 x = 24x = 397.1x = 0.9 x = 295x = 3.2

### 二、计算下面各题，怎样简便就怎样计算

1001 - 9036÷18 - 298
4.7 + 3.91÷(32 - 29.7)
(0.6 + 17.92÷3.2)×2.5
(5 - 0.8)×0.45÷0.09
3.8×5.25 + 14.5×0.2
(6.8 - 6.8×0.55)÷8.5
3.5×0.97 + 0.97×6.5
2.8×3.1 - 17.6÷8
9.3 - 3.69 + 10.7 - 6.31
99×0.52 + 0.52
2.4×(5 - 2.6)÷0.3
(4.8×1.3 + 1.6)÷1.6
125 - 100÷(2.07 - 1.27)
150 + (7.1 - 3.05)×118
20.4÷[(7.2 - 0.4)×25]

答案： 201 6.4 15.521 22.85 0.369.7 6.48 1052 19.2 4.90 222.9 0.12