1. 直接写出得数。
$6.16 + 0.8 =$ $10 - 9.3 =$ $3 ÷ 3 =$
$12 - 0.6 =$ $1.01 + 2 =$ $6 - 4.5 =$
$1.9 + 3.4 =$ $5.8 - 2.9 =$ $6 - 1.582 =$
$0.8 + 1.3 =$ $11 - 4.5 =$ $5.43 + 2.37 =$
$4.8 + 3.8 =$ $3.5 × 3 =$ $12.6 × 10 =$
$3.05 × 100 =$ $1.007 × 1000 =$ $78 × 30 =$

$6.16 + 0.8 =$6.96 $10 - 9.3 =$0.7 $3 ÷ 3 =$1
$12 - 0.6 =$11.4 $1.01 + 2 =$3.01 $6 - 4.5 =$1.5
$1.9 + 3.4 =$5.3 $5.8 - 2.9 =$2.9 $6 - 1.582 =$4.418
$0.8 + 1.3 =$2.1 $11 - 4.5 =$6.5 $5.43 + 2.37 =$7.8
$4.8 + 3.8 =$8.6 $3.5 × 3 =$10.5 $12.6 × 10 =$126
$3.05 × 100 =$305 $1.007 × 1000 =$1007 $78 × 30 =$2340

2. 列方程解决问题。
小雪对小雨说：“把我心里想到的数乘 8，再加上 20，等于 60。”小雪心里想到的数是多少？

解：设小雪心里想到的数是x。
8x + 20 = 60
8x = 60 - 20
8x = 40
x = 40 ÷ 8
x = 5
答：小雪心里想到的数是5。

3. 解方程。
$6 + 2x = 10$ $6x - 0.9 = 5.1$
$5x - 4 = 31$ $4x + 0.8 = 8.8$
$4x + 0.9 = 24.9$ $3x + 9 = 69$

解：$6 + 2x = 10$
$2x = 10 - 6$
$2x = 4$
$x = 4 ÷ 2$
$x = 2$
解：$6x - 0.9 = 5.1$
$6x = 5.1 + 0.9$
$6x = 6$
$x = 6 ÷ 6$
$x = 1$
解：$5x - 4 = 31$
$5x = 31 + 4$
$5x = 35$
$x = 35 ÷ 5$
$x = 7$
解：$4x + 0.8 = 8.8$
$4x = 8.8 - 0.8$
$4x = 8$
$x = 8 ÷ 4$
$x = 2$
解：$4x + 0.9 = 24.9$
$4x = 24.9 - 0.9$
$4x = 24$
$x = 24 ÷ 4$
$x = 6$
解：$3x + 9 = 69$
$3x = 69 - 9$
$3x = 60$
$x = 60 ÷ 3$
$x = 20$