\u516d\u5e74\u7ea7\u6570\u5b66\u8d85\u7ea7\u96be\u9898

\u4e00\u30017.5:x=3/4\uff0c\u6240\u4ee53x=7.5*4=30\uff0c\u6240\u4ee5x=10\u3002
\u4e8c\u30011\u3001x/3=20/5\uff0c\u6240\u4ee5x=12\uff1b2\u30012/13=(2/13+x)*4/9\uff0c\u6240\u4ee5x=5/26\u3002
\u4e09\u30011\u3001\u5468\u957fC=2*pi*r=1.5pi\uff0c\u4e00\u5206\u949f8\u5708\uff0c\u6240\u4ee5S=8*C=12*pi\u3002pi=3.1416
2\u3001(x/3+2)+(x/2-1)+10=x\uff0c\u6240\u4ee5x=66\u3002
3\u3001\u8bbex\u4e3a\u5ba2\u8f66\u901f\u5ea6\uff0cy\u4e3a\u603b\u8def\u7a0b\u3002\u52196x+y/8=y,6(x-15)+138=y\u3002\u5f97y-48=7y/8\uff0c\u5f97y=384\u3002
4\u3001\u8bbe\u8d27\u8f66\u901f\u5ea6\u662f4x\uff0c\u521920x+25x=450\uff0c\u5f97x=10\uff0c\u6240\u4ee5\u8d27\u8f66\u901f\u5ea6\u662f40\uff0c\u5ba2\u8f66\u901f\u5ea6\u662f50\u3002

\u7531\u9898\u5f97\uff0c\u53ea\u4f1a\u6e38\u6cf3\u7684\u4eba\u6570\u4e3a60-16-32=12\u4eba
\u4e24\u9879\u8fd0\u52a8\u90fd\u4f1a\u7684\u4eba\u6570\u4e3a12\u00f7\uff083/2\uff09=8\u4eba
\u5219\u4f1a\u6e38\u6cf3\u7684\u4eba\u4e3a12+8=20\u4eba