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1. 直接写出得数。(每题0.5分,共6分)
9÷45=
0.2×0.12=
0.8÷0.16=
0.1÷0.05=
0.84÷0.4=
12.5-2.5×4=
1.18+0.32=
40×0.5=
0.1×99+0.1=
1.25×16=
10-0.09=
7×0.4÷7×0.4=
9÷45=
0.2
0.2×0.12=
0.024
0.8÷0.16=
5
0.1÷0.05=
2
0.84÷0.4=
2.1
12.5-2.5×4=
2.5
1.18+0.32=
1.5
40×0.5=
20
0.1×99+0.1=
10
1.25×16=
20
10-0.09=
9.91
7×0.4÷7×0.4=
0.16
答案
0.2 0.024 5 2 2.1 2.5 1.5 20 10 20 9.91 0.16
2. 用竖式计算。(每题2分,共8分)
8.12+58.8=
3.05×7.4=
77÷0.35=
0.73×2.42=
8.12+58.8=
66.92
3.05×7.4=
22.57
77÷0.35=
220
0.73×2.42=
1.7666
答案
66992 22.57 (此处疑似原参考答案中第二题竖式计算第二个答案“22.57”前数字“66.92”可能为排版问题，按原样填入) 220 1.7666
解析
66.92
22.57
220
1.7666
22.57
220
1.7666
3. 计算下面各题,能简算的要简算。(每题3分,共12分)
25.25×0.4
15.25-4.72+4.75-5.28
3.6÷[(17.5+1.22)÷0.26]
(1.89+1.89×3)×2.5
25.25×0.4
15.25-4.72+4.75-5.28
3.6÷[(17.5+1.22)÷0.26]
(1.89+1.89×3)×2.5
答案
10..1 10 0.05 18.9
解析
25.25×0.4
=(25+0.25)×0.4
=25×0.4+0.25×0.4
=10+0.1
=10.1
15.25-4.72+4.75-5.28
=(15.25+4.75)-(4.72+5.28)
=20-10
=10
3.6÷[(17.5+1.22)÷0.26]
=3.6÷[18.72÷0.26]
=3.6÷72
=0.05
(1.89+1.89×3)×2.5
=1.89×(1+3)×2.5
=1.89×4×2.5
=1.89×10
=18.9
=(25+0.25)×0.4
=25×0.4+0.25×0.4
=10+0.1
=10.1
15.25-4.72+4.75-5.28
=(15.25+4.75)-(4.72+5.28)
=20-10
=10
3.6÷[(17.5+1.22)÷0.26]
=3.6÷[18.72÷0.26]
=3.6÷72
=0.05
(1.89+1.89×3)×2.5
=1.89×(1+3)×2.5
=1.89×4×2.5
=1.89×10
=18.9
