《2025年阳光同学计算小达人五年级数学下册冀教版》

1. 直接写出得数。（建议3分钟完成）
$4.8 - 0.48 =$ $8.2×0.5 =$ $15÷4 =$ $5.1×7 =$
$85÷1.7 =$ $0.83 + 2.07 =$ $24×50 =$ $1.6×5 =$
$4.72 + 5.8 =$ $280×0.3 =$ $2.16 - 0.5 =$ $2×2.5 =$
$1.2×300 =$ $17.9 + 0.21 =$ $410×0.02 =$ $0.45 - 0.3 =$
$18÷0.9 =$ $0.36÷1.8 =$ $3.2×40 =$ $7.2÷0.9 =$

答案： 4.32@@4.1@@3.75@@35.7@@50@@2.9@@1200@@8@@10.52@@84@@1.66@@5@@360@@18.11@@8.2@@0.15@@20@@0.2@@128@@8

2. 解方程。（建议6分钟完成）
$0.54 + x = 2.46$ $5x - 115 = 375$ $170 + 4x = 770$
$x÷3.5 = 8$ $9.3x - 3.6x = 34.2$ $4x - 5×0.8 = 3.6$
$20x÷1.2 = 60$ $10x + 15x = 80$ $3x - 2×2.5 = 11.2$

答案： $x = 1.92$@@$x = 98$@@$x = 150$@@$x = 28$@@$x = 6$@@$x = 1.9$@@$x = 3.6$@@$x = 3.2$@@$x = 5.4$

用简便方法计算。
$21.3×0.11 + 7.9×2.13 + 2.13$ $4.9×5.6 + 9.8×2.7 - 4.9$

答案： 21.3@@49