99×222+333×334 75×45+17×25

问题描述:

99×222+333×334 75×45+17×25
要简算

999*222+333*334
=333*3*222+333*334
=333*(666+334)
=333*1000
=333000
75*45+17*25
=75*28+75*17+25*17
=25*3*4*7+17*(75+25)
=100*21+ 17*100
=2100+1700
=3800