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1、直接写得数。
×0= × = ×12= × = 45× = 9×= × = ×100= 18×= × = 3×5=
7×1= -= += 0×=
2、计算下面各题,能简算的要简算.
××3 5×× × 4 × (+ )× 5
(+)×27 6 ×(×) (- )× ×(7 - )
×+ × ×+× ×- ×
×6 -× 6 21× 37× × 24
(+ 7 )× 25 ×+ × - × 1- ×
+ × ×(5 - ) 12×(+ + ) ×(125 × 34)
(+ )×7 ×5 × 199 × (24 + )×
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