简便计算 489*101-4 89 33*1.03 5.6*9+56 0.98*54 28*45+30*13

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/29 19:20:15
简便计算 489*101-4 89 33*1.03 5.6*9+56 0.98*54 28*45+30*13
xݒMN ’BJ+?ӻLxͬͪ uc2o!qx?׷xwDYV:"%Cha2Hk\Cٝ_6ݢ_ΑWY7& VE @%L%@* O%Ha>PL|LmA**=ڗn,; q,SvV6yU;x*U5UfD(9u!'6>j~yn~z^knM_|eDd

简便计算 489*101-4 89 33*1.03 5.6*9+56 0.98*54 28*45+30*13
简便计算 489*101-4 89 33*1.03 5.6*9+56 0.98*54 28*45+30*13

简便计算 489*101-4 89 33*1.03 5.6*9+56 0.98*54 28*45+30*13
489*101-489
=489*(101-1)
=489*100
=48900
33*1.03
=33*(1+0.03)
=33+0.99
=33.99
5.6*9+56
=5.6*(10-1)+56
=56-5.6+56
=50.4+56
=106.4
0.98*54
=(1-0.02)*54
=54-0.02*(50+4)
=54-0.02*50-0.02*4
=54-1-0.08
=52.92
28*45+30*13
=15*28*3+15*2*13
=15*(84+26)
=15*110
=15*(100+10)
=1500+150
=1650

489*101-489
=489*(101-1)
=489*100
=48900
33*1.03
=33*(1+0.03)
=33+0.99
=33.99
5.6*9+56
=5.6*(10-1)+56
=56-5.6+56
=50.4+56
=106.4
0.98*54
=(1-...

全部展开

489*101-489
=489*(101-1)
=489*100
=48900
33*1.03
=33*(1+0.03)
=33+0.99
=33.99
5.6*9+56
=5.6*(10-1)+56
=56-5.6+56
=50.4+56
=106.4
0.98*54
=(1-0.02)*54
=54-0.02*(50+4)
=54-0.02*50-0.02*4
=54-1-0.08
=52.92
28*45+30*13
=15*28*3+15*2*13
=15*(84+26)
=15*110
=15*(100+10)
=1500+150
=1650

收起