《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★)
$5b - 5b = $0 $2.5b×3 = $7.5b $5.2m×0.2 = $1.04m
$12y - y = $11y $1.8 + n + n = $1.8+2n $7.3 + (m + 2.7) = $10+m
$15a÷3 = $5a $3.4x + 6.6x = $10x $6a + 2a×2.5 = $11a
$3.6×0.7 = $2.52 $21.6 + 0.9 = $22.5 $4.7×0.5 = $2.35
$3.4×0.6 = $2.04 $6.1×0.7 = $4.27 $2.96 - 1.8 = $1.16
$1.92 + 3.36 = $5.28 $8.78 - 5.92 = $2.86 $3.1×0.4 = $1.24

答案： 0
7.5b
1.04m
11y
1.8+2n
10+m
5a
10x
11a
2.52
22.5
2.35
2.04
4.27
1.16
5.28
2.86
1.24

2. 解方程。(每题 4★)
$5x + 2 = 17$ x=3
$x÷0.8 = 1.6$ x=1.28
$7x + 25 = 228$ x=29
$5x + 4.4 = 19.4$ x=3
$4x - 3×0.9 = 5.3$ x=2
$12x - 68.2 = 3.8$ x=6
$1.5 + 3x = 10.5$ x=3
$(8x + 2)÷2 = 33$ x=8
$3(x + 12) = 102$ x=22

答案： x=3
x=1.28
x=29
x=3
x=2
x=6
x=3
x=8
x=22