脱式计算.(怎样简便怎样算).不要光等得数,

(1)64×1.25
=8×8×1.25
=8×10
=80
(2)9.83+0÷9.83-9.83
=(9.83-9.83)+0÷9.83
=0+0
=0
(3)6666×9+1111×46
=1111×6×9+1111×46
=1111×54+1111×46
=1111×(54+46)
=1111×100
=111100
(4)518×27.5+48.2×275
=51.8×275+48.2×275
=(51.8+48.2)×275
=51.8×100
=5180
(5)1+99+3+97+5+95+……+49+51
=25×100
=2500
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(1)64×1.25 =8×(8×1.25)=8×10=80(2)9.83＋0÷9.83－9.83=9.83-9.83=0
(3)6666×9＋1111×46=1111×6×9+1111×46=1111×(54+46）=1111×100=111100 (4)518×27.5＋48.2×2...