依题意:(9/10)x67.8+54.3÷10/9-22.1x90/100=9/10x67.8+54.3x9/10-22.1x9/10=9/10(67.8+54.3-22.1)=9/10x100=90 回答完毕
简便计算
9/10x67.8+54.3÷1又1/9-22.1x90%
=9/10x67.8+54.3x9/10-22.1x9/10
=9/10x(67.8+54.3-22.1)
=9/10x100
=90
10分之9×67.8+54.3÷1又9分之1-22.1×90%
=10分之9×67.8+54.3×10分之9-22.1×10分之9
=(67.8+54.3-22.1)×10分之9
=100×10分之9
=90