5.99乘以99加199递等式巧算
=99x99+99+100
=99x(99+1)+100
=99x100+100
=9900+100
=10000
6.67000除以125递等式巧算
=67x1000÷125
=67×8
=536
9.3500除以125递等式巧算
=(2500+1000)÷125
=2500÷125+1000÷125
=20+8
=28
5.99乘以99加199递等式巧算 6.67000除以125递等式巧算9.3500除以125递等式巧算
5.99乘以99加199递等式巧算
=99x99+99+100
=99x(99+1)+100
=99x100+100
=9900+100
=10000
6.67000除以125递等式巧算
=67x1000÷125
=67×8
=536
9.3500除以125递等式巧算
=(2500+1000)÷125
=2500÷125+1000÷125
=20+8
=28