(北京)求x的值.(1)x﹣χ=(2):=x:15(3).
4a+5a= 9b-2b=6x-3x= 7n+10n=
直接写出得数。9.12+4.5+0.88= 8.43+2.97+0.03= 10-2.75-0.25=4.9+4.9-0.9-0.9= 5.6+2.7-3.6= 15.25-3.1+0.75-4.9=
车里面应该填几?
用竖式计算。8.4+16.72 20-3.46 8.34+112.7 196.5-7.78
用竖式计算并验算。80-52.1= 7.35-1.41=