6.c6.c【第4篇】12.6x-yy+z14.2/31.d七年级上册数学寒假作业答案【八篇】,10.1/3480【第1篇】4.c15.-8/8【第3篇】1117616.-1214.180,7.123cm9.12本,4.a12.1.28.d11.5.1×10^83.d21.①.全8座5辆②全4座9辆③1个4座其余8座得一个4座4个8座7.c4.410.a20.-14-11-5-241617.111/108.a18.k=5/3x=-29/52.c9.-218.18a-18b-25.d2.d10.49/100