1/3×(15+3/14) 42×(19/14-8/21) 1/5×1/10×75×7/15 9/10×4+2/5 简便计算四道.
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1/3×(15+3/14) 42×(19/14-8/21) 1/5×1/10×75×7/15 9/10×4+2/5 简便计算四道.
1/3×(15+3/14) 42×(19/14-8/21) 1/5×1/10×75×7/15 9/10×4+2/5 简便计算四道.
1/3×(15+3/14) 42×(19/14-8/21) 1/5×1/10×75×7/15 9/10×4+2/5 简便计算四道.
1/3×(15+3/14)
=1/3X15+1/3X3/14
=5+1/14
=5又14分之1
42×(19/14-8/21)
=42X19/14-42X8/21
= 57-16
=41
1/5×1/10×75×7/15
=1/50X (75×7/15)
=1/50X35
=7/10
9/10×4+2/5
=18/5+2/5
=20/5
=4