52x38十38x49一38用简便方法计算
用简便方法计算下面各题3/8X5/7+5/8X4/738/37X21+21/373/4X73+26X3/4+0.75=========...
用简便方法计算下面各题
3/8X5/7+5/8X4/7 38/37X21+21/37 3/4X73+26X3/4+0.75
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3/8X5/7+5/8X4/7 38/37X21+21/37 3/4X73+26X3/4+0.75
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3/8X5/7+5/8X4/7
＝5/8x3/7+5/8x4/7
=5/8x(3/7+4/7)
=5/8x1
=5/8
38/37X21+21/37
=38x21/37+21/37
=(38+1)x21/37
=(37+2)x21/37
=37x21/37+2x21/37
=21+42/37
=22又5/37
3/4X73+26X3/4+0.75
＝3/4x73+3/4x26+3/4
=3/4x(73+26+1)
=3/4x100
=75
＝5/8x3/7+5/8x4/7
=5/8x(3/7+4/7)
=5/8x1
=5/8
38/37X21+21/37
=38x21/37+21/37
=(38+1)x21/37
=(37+2)x21/37
=37x21/37+2x21/37
=21+42/37
=22又5/37
3/4X73+26X3/4+0.75
＝3/4x73+3/4x26+3/4
=3/4x(73+26+1)
=3/4x100
=75
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