用简便方法计算下面各题，312乘4+188乘4，135乘50乘2，10乘87，25乘33乘4
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312乘4+188乘4
=（312+188）x4
=500x4
=2000
135乘50乘2
=135x(50x2)
=135x100
=13500
10乘87
=10x(90-3)
=10x90-10x3
=900-30
=870
25乘33乘4
=25x4x33
=100x33
=3300
=（312+188）x4
=500x4
=2000
135乘50乘2
=135x(50x2)
=135x100
=13500
10乘87
=10x(90-3)
=10x90-10x3
=900-30
=870
25乘33乘4
=25x4x33
=100x33
=3300
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