14.5*(0.12+0.23+0.34)-(0.12+0.23+0.34+1)*4.5的简算
问题描述:
14.5*(0.12+0.23+0.34)-(0.12+0.23+0.34+1)*4.5的简算
答
14.5*(0.12+0.23+0.34)-(0.12+0.23+0.34+1)*4.5
=14.5*(0.12+0.23+0.34)-(0.12+0.23+0.34)*4.5-4.5
=(0.12+0.23+0.34)*(14.5-4.5)-4.5
=0.69*10-4.5
=6.9-4.5
=2.4
答
14.5*(0.12+0.23+0.34)-(0.12+0.23+0.34+1)*4.5
=10*(0.12+0.23+0.34)+4.5*(0.12+0.23+0.34)-4.5*(0.12+0.23+0.34)-4.5
=6.9-4.5
=2.4