一、口算。
$1.65×0.2=$
$7.6÷0.19=$
$1.3×0.7=$
$0.42÷0.3=$
$6.8+8.6=$
$1.2÷0.05=$
$0.63+0.7=$
$0.8×0.15=$
$1.65×0.2=$
0.33
$0.3÷0.1=$3
$(1-0.1)×0.1=$0.09
$7.6÷0.19=$
40
$9.8-0.98=$8.82
$0.9×7+13.7=$20
$1.3×0.7=$
0.91
$1.43+2.6=$4.03
$(6.6-2.4)÷3=$1.4
$0.42÷0.3=$
1.4
$7.01-2.2=$4.81
$20-3.7+7.3=$23.6
$6.8+8.6=$
15.4
$9.5×0.4=$3.8
$1.6÷0.8×0.5=$1
$1.2÷0.05=$
24
$2.19-0.9=$1.29
$1.25×3.3×8=$33
$0.63+0.7=$
1.33
$155÷31=$5
$1.1-(0.6+0.4)=$0.1
$0.8×0.15=$
0.12
$8.76+3.24=$12
$0.5×(0.8+1.4)=$1.1
答案
一、0.33 3 0.09 40 8.82 20 0.91 4.03 1.4 1.4 4.81 23.6 15.4 3.8 1 24 1.29 33 1.33 5 0.1 0.12 12 1.1
二、解方程。
$1-0.8+5x=3.6$ $7x-5.3x=6.8$ $1.4×8-2x=6$
$120+3x=270$ $8×1.25+7x=87$ $4x+15=10x-3$
$1-0.8+5x=3.6$ $7x-5.3x=6.8$ $1.4×8-2x=6$
$120+3x=270$ $8×1.25+7x=87$ $4x+15=10x-3$
答案
二、x=0.68 x=4 x=2.6 x=50 x=11 x=3
解析
解:1-0.8+5x=3.6
0.2+5x=3.6
5x=3.4
x=0.68
解:7x-5.3x=6.8
1.7x=6.8
x=4
解:1.4×8-2x=6
11.2-2x=6
2x=5.2
x=2.6
解:120+3x=270
3x=150
x=50
解:8×1.25+7x=87
10+7x=87
7x=77
x=11
解:4x+15=10x-3
15+3=10x-4x
18=6x
x=3
0.2+5x=3.6
5x=3.4
x=0.68
解:7x-5.3x=6.8
1.7x=6.8
x=4
解:1.4×8-2x=6
11.2-2x=6
2x=5.2
x=2.6
解:120+3x=270
3x=150
x=50
解:8×1.25+7x=87
10+7x=87
7x=77
x=11
解:4x+15=10x-3
15+3=10x-4x
18=6x
x=3
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