简便计算.5.68减4.98减0.11,1除以(1减0.98),9.9乘7.8.
问题描述:
简便计算.5.68减4.98减0.11,1除以(1减0.98),9.9乘7.8.
答
5.68-4.98-0.11
=0.7-0.11
=0.59
1÷(1-0.98)
=1÷0.02
=(1x5)÷(0.02x5)
=5÷0.1
=50
9.9x7.8
=(10-0.1)x7.8
=10x7.8-0.1x7.8
=78-0.78
=77.22