小学数学六年级题
\u5c0f\u5b66\u6570\u5b66\u516d\u5e74\u7ea7\u98981.\u6bd4\u4f8b\u5c3a\u4e3a200\uff1a1\uff0c\u56fe\u4e0a\u8ddd\u79bb\u4e3a1.5CM\uff0c\u5b9e\u9645\u8ddd\u79bb\u662f\uff083\u7c73\uff09\u3002
2.5000cm=50\u7c73
\u753b\u4e00\u6761\u7ebf\u6bb5\uff0c\u957f\u4e00\u5398\u7c73\uff0c\u5de6\u9762\u4e00\u7aef\u6807\u4e0a0\uff0c\u53e6\u4e00\u7aef\u6807\u4e0a50\u7c73\uff0c\u5c31OK\u4e86\u3002
\u5982\u56fe\uff0c\u767d\u8272\u7ebf\u5373AB\uff0c\u79f0\u4e3ad1\uff0c\u73b0\u5728\u628aAB\u5206\u4e3a\u4e94\u6bb5\uff0c\u5373\u8fd9\u4e94\u4e2a\u5706\u7684\u76f4\u5f84\uff0c\u5206\u522b\u662fd2\u3001d3\u3001d4\u3001d5\u3001d6\u3002\u6839\u636e\u5706\u7684\u5468\u957f\u516c\u5f0f\u53ef\u4ee5\u77e5\u9053C=\u03c0d\u3002
\u4ee5d2\u4e3a\u76f4\u5f84\u7684\u5c0f\u5706\u7684\u5468\u957f\u5c31\u662fC=\u03c0d2\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u540e\u9762\u7684\u5706\u7684\u5468\u957f\u516c\u5f0f\u5373C=\u03c0d2\uff0cC=\u03c0d3\u2026\u2026
\u5468\u957f\u603b\u548c\u5c31\u662f\u8fd9\u4e9b\u5706\u7684\u5468\u957f\u4e4b\u548c\uff0c\u4e5f\u5c31\u8981\u628a\u6c42\u5468\u957f\u7684\u516c\u5f0f\u5408\u8d77\u6765\uff0c\u516c\u5f0f\u5c31\u662fC=\u03c0d2+\u03c0d3+\u03c0d4+\u03c0d5+\u03c0d6\uff0c\u73b0\u5728\u53ef\u4ee5\u505a\u4e00\u4e2a\u7c7b\u4f3c\u4e58\u6cd5\u5206\u914d\u5f8b\u7684\u5408\u5e76\uff0c\u6bcf\u4e2a\u5f0f\u5b50\u4e2d\u90fd\u6709\u03c0\uff0c\u5f0f\u5b50\u5c31\u53ef\u4ee5\u5408\u5e76\u4e3a\uff1aC=\u03c0\uff08d2+d3+d4+d5+d6\uff09\uff0c\u73b0\u5728\u518d\u770b\uff1ad2+d3+d4+d5+d6\u5c31\u662f\u7b49\u4e8ed1\uff0c\u8fd9\u4e9b\u5706\u7684\u76f4\u5f84\u52a0\u8d77\u6765\u5c31\u662fAB\uff0c\u537330cm\uff0c\u6240\u4ee5\u4e0b\u4e00\u6b65\u5c31\u662f\uff1aC=\u03c0d1=3.14\u00d730=94.2\uff08cm)
\u7ed3\u9898\u6b65\u9aa4\uff1a\u50cf\u6211\u8fd9\u6837\u5728\u56fe\u4e0a\u6807\u51fad2\u5230d6\uff0c\u7136\u540e\u5199\uff1a
C=\u03c0d2+\u03c0d3+\u03c0d4+\u03c0d5+\u03c0d6
=\u03c0\uff08d2+d3+d4+d5+d6\uff09
=\u03c0d1
=3.14\u00d730
=94.2\uff08cm\uff09
\u7b54\uff1a\u5468\u957f\u4e4b\u548c\u4e3a94.2cm\u3002
1.①(X-4)/4= 20% ②(2-X)/2=25%
X-4=80% 2-X=50% X=4.8 X=1.5
2. X/16=Y/12=0.25=1/Z=A%
X=4. Y=3. Z=4. A=25
3. 3.14(6²-5²)=28.26CM²
4. X*2/3=9/6Y=12Z=4.5A=B0.5=1
X=2/3 Y=2/3 Z=1/12 A=2/9 B=2
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