《2025年一本暑假计算加应用题四年级数学北师大版》

1. 直接写出得数。(每题1★)
$y + y = $$2y$ $a + a + a = $$3a$ $b + 3b - 2b = $$2b$
$5×x = $$5x$ $2.5x - x = $$1.5x$ $2×n×2.5 = $$5n$
$7a×2a = $$14a^{2}$ $7×x×x = $$7x^{2}$ $8y÷2×4 = $$16y$
$7n + 3n = $$10n$ $2×m - n = $$2m - n$ $5x + 5x - 4x = $$6x$
$3.9x - 1.2x = $$2.7x$ $36×x×0.4 = $$14.4x$ $3a + 24a÷8 = $$6a$
$0.5a + 0.5a = $$a$ $y + 0.5x×2 = $$y + x$ $2b + 11b - 5a = $$13b - 5a$

答案： $2y$ $3a$ $2b$ $5x$ $1.5x$ $5n$ $14a^{2}$ $7x^{2}$ $16y$ $10n$ $2m - n$ $6x$ $2.7x$ $14.4x$ $6a$ $a$ $y + x$ $13b - 5a$

2. 用竖式计算。(每题3★)
$21.7 + 9.26 = $30.96 $0.706×0.34 = $0.24004 $6.62×5.5 = $36.41

答案： $30.96$ $0.24004$ $36.41$（竖式略）

3. 计算下面各题,能简算的要简算。(每题4★)
$8.7×10.1$ $0.125×9.6×8$ $3.87×4.8 + 48×0.613$
$0.25×(8 - 0.4)$ $6.65 + 4.8 + 3.35$ $12.85 - 2.62 - 7.38$

答案： $87.87$ $9.6$ $48$ $1.9$ $14.8$ $2.85$