一、填表。
|图形|底|高|面积|
|平行四边形|4cm|8cm||
| ||5dm|$60dm^2$|
|三角形|7cm|12cm||
| |8m||$64m^2$|
|梯形|上底|下底|高|面积|
| |14cm|12cm|4cm||
| |2dm|3dm||$30dm^2$|
| ||6m|16m|$64m^2$|

一、$32cm^{2}$ $12dm$ $42cm^{2}$ $16m$ $52cm^{2}$ $12dm$ $2m$

平行四边形面积：$4×8=32(cm^{2})$
平行四边形底：$60÷5=12(dm)$
三角形面积：$7×12÷2=42(cm^{2})$
三角形高：$64×2÷8=16(m)$
梯形面积：$(14 + 12)×4÷2=52(cm^{2})$
梯形高：$30×2÷(2 + 3)=12(dm)$
梯形上底：$64×2÷16 - 6=2(m)$
$32cm^{2}$；$12dm$；$42cm^{2}$；$16m$；$52cm^{2}$；$12dm$；$2m$

二、用简便方法计算下面各题。
27×102-54 189-41+111+159 (825+375)÷25÷4
45×99 25×125×(8×4) 75×48+75×52
850-47-153 454-(181-46)-19 43×126-32×126-126

二、$2700$ $418$ $12$ $4455$ $100000$ $7500$ $650$ $300$ $1260$

27×102-54
=27×102-27×2
=27×(102-2)
=27×100
=2700
189-41+111+159
=(189+111)+(159-41)
=300+118
=418
(825+375)÷25÷4
=1200÷(25×4)
=1200÷100
=12
45×99
=45×(100-1)
=45×100-45×1
=4500-45
=4455
25×125×(8×4)
=(25×4)×(125×8)
=100×1000
=100000
75×48+75×52
=75×(48+52)
=75×100
=7500
850-47-153
=850-(47+153)
=850-200
=650
454-(181-46)-19
=454-181+46-19
=(454+46)-(181+19)
=500-200
=300
43×126-32×126-126
=126×(43-32-1)
=126×10
=1260