一个钢质的圆柱体零件重1763.424克，它的侧面展开图是一个长方形，长方形的长（不是圆柱体的高）是18.84厘米，求这个圆柱体的高（每立方厘米钢重7.8克）．
直接写出得数÷=÷3= 6×=﹣= 7÷=+=×7=÷=
口算．÷2=﹣=÷= 20%+3= 20÷20%= 2×4÷2×4= 12×0×60%= 289÷57≈
口算．﹣=÷=÷7=×= 1﹣40%= 1÷37.5%= 2.1×= 82=×4÷×4= 20×（+）= 9.9×99+9.9=π+π=
直接写出复数．+0.125= 4×÷4×=﹣= 0.1×10÷0.1×10= 2.5×40=﹣×= 36：0.8= 8.9×11﹣8.9=÷= 10÷0.1×10=
①=②=③= ④= ⑤= ⑥=⑦=⑧= ⑨= ⑩= ．
÷
=
÷3= 6×
=
﹣
=
=
+
=
×7=
÷
=
÷2=
﹣
=
÷
= 20%+3=
﹣
=
÷
=
÷7=
=
= 82=
×4÷
+
）= 9.9×99+9.9=
π=
+0.125= 4×
÷4×=
﹣
= 0.1×10÷0.1×10= 2.5×40=
﹣
×= 36：0.8= 8.9×11﹣8.9=
÷
= 10÷0.1×10=+0.125= 4×÷4×=﹣= 0.1×10÷0.1×10= 2.5×40=﹣×= 36：0.8= 8.9×11﹣8.9=÷= 10÷0.1×10=
=②
=③
= ④
= 
= ⑥
=⑦
=⑧
= 
= ⑩
= ．
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