一、 口算:0.1×208= 7.2÷36= 4.8÷16=1.3×50= 0.5×20= 0.81÷0.09=4.2÷4= 0.98÷7= 0.39÷1.3=2.5×40= 4.7×2= 0.4×0.5=二、 简算:0.46×7.5＋0.46×2.5 8.6×0.24+0.86×7.6三、 计算题:1.1.08÷(3.94＋34.3×0.2)－0.082.4.8×(11.03－15.6÷

一、 口算:0.1×208= 7.2÷36= 4.8÷16=1.3×50= 0.5×20= 0.81÷0.09=4.2÷4= 0.98÷7= 0.39÷1.3=2.5×40= 4.7×2= 0.4×0.5=二、 简算:0.46×7.5＋0.46×2.5 8.6×0.24+0.86×7.6三、 计算题:1.1.08÷(3.94＋34.3×0.2)－0.082.4.8×(11.03－15.6÷
一、 口算:
0.1×208= 7.2÷36= 4.8÷16=
1.3×50= 0.5×20= 0.81÷0.09=
4.2÷4= 0.98÷7= 0.39÷1.3=
2.5×40= 4.7×2= 0.4×0.5=
二、 简算:
0.46×7.5＋0.46×2.5 8.6×0.24+0.86×7.6
三、 计算题:
1.1.08÷(3.94＋34.3×0.2)－0.08
2.4.8×(11.03－15.6÷7.5)

一、 口算:0.1×208= 7.2÷36= 4.8÷16=1.3×50= 0.5×20= 0.81÷0.09=4.2÷4= 0.98÷7= 0.39÷1.3=2.5×40= 4.7×2= 0.4×0.5=二、 简算:0.46×7.5＋0.46×2.5 8.6×0.24+0.86×7.6三、 计算题:1.1.08÷(3.94＋34.3×0.2)－0.082.4.8×(11.03－15.6÷
一、 口算:
0.1×208= 20.8 7.2÷36=20 4.8÷16=30
1.3×50= 65 0.5×20= 10 0.81÷0.09=9
4.2÷4= 1.05 0.98÷7= 0.14 0.39÷1.3= 0.3
2.5×40= 100 4.7×2=9.4 0.4×0.5=0.2
二、 简算:
0.46×7.5＋0.46×2.5
=0.46×(7.5+2.5)
=0.46×10
=4.6
8.6×0.24+0.86×7.6
=8.6×0.24+8.6×0.76
=8.6×(0.24+0.76)
=8.6×1
=8.6
三、 计算题:
1.1.08÷(3.94＋34.3×0.2)－0.08
=1.08÷(3.94＋6.86)－0.08
=1.08÷10.8－0.08
=0.1 -0.08
=0.02
2.4.8×(11.03－15.6÷7.5)
=4.8×(11.03－ 2.08)
=4.8×8.95
=42.96

一由上到下由左到右依次为:20.8 0.2 0.3 65 10 9 1.05 0.14 0.3 100 9.4 0.2
二0.46*7.5+0.46*2.5=0.46*10=4.6
8.6*0.24+0.86*7.6=8.6*1=8.6

0.1×208=20.8 7.2÷36=0.5 4.8÷16=0.3
1.3×50=65 0.5×20=10 0.81÷0.09=9
4.2÷4=1.05 0.98÷7=0.14 0.39÷1.3=0.3
2.5×40=100 4...

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0.1×208=20.8 7.2÷36=0.5 4.8÷16=0.3
1.3×50=65 0.5×20=10 0.81÷0.09=9
4.2÷4=1.05 0.98÷7=0.14 0.39÷1.3=0.3
2.5×40=100 4.7×2=9.4 0.4×0.5=0.2
二、 简算:
0.46×7.5＋0.46×2.5 8.6×0.24+0.86×7.6
=0.46×(7.5+2.5) =0.86×2.4+0.86×7.6
=0.46×10 =0.86×(2.4+7.6)
=4.6 =0.86×10
=8.6
三、 计算题:
1. 1.08÷(3.94＋34.3×0.2)－0.08
=1.08÷(3.94+6.86)-0.08
=1.08÷10.8-0.8
=0.1-0.08
=0.02
2. 4.8×(11.03－15.6÷7.5)
=4.8×(11.03-2.08)
=4.8×8.95
=42.96

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