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简介:
1.请用简便方法计算下面各题
1)125×(17×8)×4 2)150×40÷50
=125×8×4×17 =150÷50×40
=1000×68 =3×40
=68000 =120
3)50×(2×4)×25 4)7×8×3×125
=(50×2)×(4×25) =(7×3)×(8×125)
=100×100 =21×1000
=10000 =21000
5)19999+9999x9999 6)(99x99+99)÷0.99
=10000+9999+9999x9999 =【99x(99+1)】÷0.99
=10000+9999x(9999+1) =(99x100)÷0.99
=100000000 =10000