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1. 直接写出得数。
0.56÷0.8=
2.5×4=
5-2.99=
4n+5n=
0.4×0.2=
0.24+0.36=
$20^2= $
7y-6y=
0.56÷0.8=
0.7
2.5×4=
10
5-2.99=
2.01
4n+5n=
9n
0.4×0.2=
0.08
0.24+0.36=
0.6
$20^2= $
400
7y-6y=
y
答案
0.7
10
2.01
9n
0.08
0.6
400
y
10
2.01
9n
0.08
0.6
400
y
2. 用竖式计算,带*的要验算。
*26.4-3.79=
0.31×2.4≈(得数保留一位小数)
4.5÷0.25=
*26.4-3.79=
0.31×2.4≈(得数保留一位小数)
4.5÷0.25=
答案
22.61
0.7
18
3. 计算下面各题,能简算的要简算。
12.13+7.15-1.13+2.85
31.6÷(7.9-5.4)÷0.4
1.53×2.4-0.24×10.3
5.6÷[125×(0.74-0.66)]
12.13+7.15-1.13+2.85
31.6÷(7.9-5.4)÷0.4
1.53×2.4-0.24×10.3
5.6÷[125×(0.74-0.66)]
答案
=(12.13-1.13)+(7.15+2.85)
=11+10
=21
=31.6÷2.5÷0.4
=31.6÷(2.5×0.4)
=31.6÷1
=31.6
=0.24×(15.3-10.3)
=0.24×5
=1.2
=5.6÷(125×0.08)
=5.6÷10
=0.56
=11+10
=21
=31.6÷2.5÷0.4
=31.6÷(2.5×0.4)
=31.6÷1
=31.6
=0.24×(15.3-10.3)
=0.24×5
=1.2
=5.6÷(125×0.08)
=5.6÷10
=0.56
