46×2/45
=(45+1)×2/45
=45×2/45+1×2/45
=2+2/45
=2又2/45
第二个错了
4.3×9.9＋0.43
=4.3×9.9+4.3×0.1
=4.3×(9.9+0.1)
=4.3×10
=43
46×2／45 4.3×99＋0.43 这两道题简便应算,教教我,
46×2/45
=(45+1)×2/45
=45×2/45+1×2/45
=2+2/45
=2又2/45
第二个错了
4.3×9.9＋0.43
=4.3×9.9+4.3×0.1
=4.3×(9.9+0.1)
=4.3×10
=43