《2025年亮点给力计算天天练五年级数学下册苏教版》

1. 直接写出得数。
3.8 + 2 = 12.5 - 0.8 = 0.28×5 = 3.5÷(0.2 + 0.3) =
5.2 - 2.71 = 2.7×30 = 16×0.2 = 45÷1.5×0.3 =
3.7 + 7.3 = 12.5÷5 = 0.03×40 = 0.6÷0.03÷0.2 =
7.5 - 7.05 = 3.2×4 = 5.1 - 1.7 = 0.3×6÷2 =
2.8 + 3.29 = 3.85 + 2.7 = 0.32÷0.4 = 0.28÷0.7 + 2.3 =
4.2×0.2 = 1.1×0.9 = 7.2 + 0.9 = 1.2÷0.6×0.1 =
2.3 - 1.8 = 88÷110 = 14.2 - 7.8 = 1.7×9 + 1.7 =
3.02 + 4.8 = 5 - 0.85 = 4.6×0.1 = 0.8×8÷2 =

答案： 5.8 11.7 1.4 7
2.49 81 3.2 9
11 2.5 1.2 100
0.45 12.8 3.4 0.9
6.09 6.55 0.8 2.7
0.84 0.99 8.1 0.2
0.5 0.8 6.4 17
7.82 4.15 0.46 3.2

2. 解方程。
20 + 2x = 170 x + 0.92 = 1.07 + 0.8 x - 9.5 + 0.5 = 12
2x - 48 = 140 (x - 32)×5 = 115 4×9.5 - 4x = 30

答案： $x = 75$ $x = 0.95$ $x = 21$
$x = 94$ $x = 55$ $x = 2$

思维提升 错中求解
明明在计算(x + 0.79)×1.9时，漏看了括号，算出的结果比正确结果小0.27，则正确结果应该是多少？

答案： $(x + 0.79)\times1.9 = 1.9x + 0.79\times1.9$
$1.9x + 0.79\times1.9 - (x + 0.79\times1.9) =$
$1.9x - x = 0.9x = 0.27$ $x = 0.3$ $(x +$
$0.79)\times1.9 = (0.3 + 0.79)\times1.9 = 2.071$。
解析·根据漏看括号的算式$x + 0.79\times1.9$比原算式$(x + 0.79)\times1.9$结果小0.27可列方程解出$x$。