黄冈小状元五下册答案图片(黄冈小状元五下册答案)

导读 大家好,小跳来为大家解答以上的问题。黄冈小状元五下册答案图片,黄冈小状元五下册答案这个很多人还不知道,现在让我们一起来看看吧!1、一...
2024-07-18 09:20:05

大家好,小跳来为大家解答以上的问题。黄冈小状元五下册答案图片,黄冈小状元五下册答案这个很多人还不知道,现在让我们一起来看看吧!

1、一,6.28 9.42 12.56 15.7 18.84 21.98 25.12 28.26二,8 125.6 50.24 226.08 5 314 78.5 471三,S侧=πdh =3.14x6x2.6 =18.84x2.6 =48.984(dm²)答:需要铝皮48.984dm²。

2、r=6÷2=3(dm)S底=πr² =3.14x3² =3.14x9 =28.26(dm²)28.26x2=56.52(dm²)答:需要羊皮56.52dm²。

3、四,S侧=πdh =3.14x6x1.2 =18.84x1.2 =22.608(m ²)r=6÷2=3(m)S底=πr² =3.14x3² =3.14x9 =28.26(m²)S总=S侧+S底 =22.608+28.26 =50.868(m ²)答:50.868m ²五,S侧=πdh =3.14x0.6x1 =1.884x1 =1.884(m ²)r=0.6÷2=0.3(m)S底=πr² =3.14x0.3² =3.14x0.9 =0.2826(m²)0.2826x2=0.5652(m²)0.5652+1.884=2.4492(m²)2.4492x0.2≈0.49(kg)答:大约需要防锈油漆0.49kg。

4、六,S侧=2πrh =6.28x3x10 =18.84x10 =188.4(cm²)1平方米=10000平方厘米10000÷188.4≈53(个)答:最多能做53个。

5、七,S侧=πdh =3.14x1.8x5 =5.652x5 =28.26(m²)28.26x20=565.2(m²)答:面积是565.2m²。

6、培优作业八,r=C÷π÷2 =18.84÷3.14÷2 =6÷2 =3(dm)d=3x2=6(dm)10-6=4(dm)S侧=ch =18.84x4 =75.36(dm²)S底=πr² =3.14x3² =3.14x9 =28.26(dm²)S表=S侧+S底x2 =75.36+28.26x2 =75.36+56.52 =131.88(dm²)答:是131.88dm²。

7、 第九页也送给你。

8、一,3.92m² 96dm² 273.18cm²二,2 3 2 三,10x五分之六=12(cm)r=10÷2=5(cm)S侧=πdh =3.14x10x12 =31.4x12 =376.8(cm²)S底=πr² =3.14x5² =3.14x25 =78.5(cm²)S总=S侧+S底 =376.8+78.5 =455.3(cm²)答:需要455.3cm²的不锈钢薄板。

9、四,15x三分之一=5(cm)S侧=πdh =3.14x6x5 =18.84x5 =94.2(cm²)答:是94.2cm²。

10、五,d=8x2=16(cm)S长=16x6 =96(cm²)96x2=192(cm²)答:增加192cm²。

11、六,r=C÷π÷2 =15.7÷3.14÷2 =5÷2 =2.5(cm)S侧=ch =15.7x15.7 =246.49(cm²)S底=πr² =3.14x2.5² =3.14x6.25 =19.625(cm²)S表=S侧+S底x2 =246.49+19.625x2 =246.49+39.25 =285.74(cm²)答:285.74cm²。

12、七,4-1=3(次)3x2=6(个)S底=18.84÷6=3.14(dm²)r²=3.14÷3.14 =1(dm²)r=1÷1=1(dm)C=2πr =6.28x1 =6.28(dm)S侧=ch =6.28x20 =125.6(dm²)S表=S侧+S底x2 =125.6+3.14x2 =125.6+6.28 =131.88(dm²)答:表面积为131.88dm²。

13、培优作业八,C=S侧÷h =3.14÷5 =6.28(cm)r=c÷π÷2 =6.28÷3.14÷2 =2÷2 =1(cm)S侧=2πrh =6.28x1x20 =6.28x20 =125.6(cm²)S底=πr² =3.14x1² =3.14x1 =3.14(cm²)S表=S侧+S底x2 =125.6+3.14x2 =125.6+6.28 =131.88(cm²)答:原来是131.88cm²。

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