1×2×3×4×5×6×7×8×9×0= .
简便算法17.08×2.53﹣7.08×2.53 100×0.97×99+3×9919.25×9.5+19.25×0.4+0.1×19.25.
125×12=1250+250 .
根据运算定律在□填数,在○里填运算符号.(35+26)×4=(□○□)○(□○□)740÷37÷2=740÷(□○□)125×26﹣125×18=(□○□)○□
59×99+59= ×( + ),这是根据乘法 进行简便计算的.
9ⅹ+ⅹ=(□+□)•□ .