239x4=956,竖式是:239 x 34 956
=53808
239÷61=356
239 x 74-------- 9561673--------17686
239除以7列竖式计算239÷7=34..1 验算34*7+1=239
32x4÷324=(32÷32)x(4x4)=1x16=16
45*239=10755
45*240=90*120=1080010800-45=10755