《2025年通城学典计算能手四年级数学下册青岛版》

一、解方程。
3x - 0.2x=16.8
8x÷25=16
32×4+8x=250
x - 13 - 4.2=0.6
5x - 7.2×3=3.4
(1.2+1.8)x+6=168
5x+34=54
1.2(x - 1)=24
1.3x+7.2x=10.2
0.5×50+0.5x=35
x÷(2.1+4)=8.5
(x+3)÷6=2.17
5x+3x=20.8
3.4x - 28=46.8
2.8x - 2.5x=7.5

答案： x = 6 x = 50
x = 15.25
x = 17.8 x = 5
x = 54
x = 4 x = 21
x = 1.2
x = 20 x = 51.85
x = 10.02
x = 2.6 x = 22
x = 25

二、计算下面各题，怎样简便就怎样计算。
4.34×101 - 4.34
4.8 - 3.6×0.5+0.4
6.3+0.84+3.7+8.16
6.7+19.34 - 3.6÷0.6
(6.2+2.8)÷0.4 - 2.5
73.2 - (52 - 6.5)÷2.5
2.6×0.35+2.6×0.65
1.2×(9.6÷2.4)÷4.8
7.5+(32.4 - 11.6)÷0.64
10 - 5×2.44×0.2
1.5×(10 - 15.6÷7.5)
(71.2 - 71.2×0.9)÷0.25
9.12÷4×(3.6÷0.9)
9.5÷[(1 - 0.5)÷0.1]
5.4×27+5.4×72+5.4

答案： 434 3.4 19
20.04 20 55
2.6 1 40
7.56 11.88 28.48
9.12 1.9 540