(2)列竖式计算。
$4.85×0.73$
$78.4+21.56$
$15-6.93$
$84÷12$

1. $4.85×0.73=3.5405$
2. $78.4+21.56=99.96$
3. $15-6.93=8.07$
4. $84÷12=7$

(3)解方程。
$5.34 + x = 26.7$
$x ÷ 0.6 = 4.5$
$2x - 8 = 24$
$3x + 5 = 32$
(4)脱式计算。(能简算的要简算)
$7.6 + 0.9 + 2.4 + 0.1$
$3.7 + 63 ÷ 7 - 0.4$
$8.2 - 0.6 × (0.9 - 0.75)$
$5.6 × 6.8 + 4.4 × 6.8$

(3)
1. $5.34 + x = 26.7$，$x=21.36$
2. $x ÷ 0.6 = 4.5$，$x=2.7$
3. $2x - 8 = 24$，$x=16$
4. $3x + 5 = 32$，$x=9$
(4)
1. $7.6 + 0.9 + 2.4 + 0.1=11$
2. $3.7 + 63 ÷ 7 - 0.4=12.3$
3. $8.2 - 0.6 × (0.9 - 0.75)=8.11$
4. $5.6 × 6.8 + 4.4 × 6.8=68$