几道题要过程

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几道题要过程几道题要过程几道题要过程5/14×(14/25+28)=5/14×14/25+5/14×28=1/5+10=10又1/53/5×8/9÷5/8=8/15×8/5=64/757/9÷1/2÷

几道题要过程
几道题要过程


几道题要过程
5/14×(14/25+28)
=5/14×14/25+5/14×28
=1/5+10
=10又1/5
3/5×8/9÷5/8
=8/15×8/5
=64/75
7/9÷1/2÷35/36
=14/9×36/35
=8/5
=1又3/5
7÷70%
=7÷0.7
=10
4/23×16+16×19/23
=16×(4/23+19/23)
=16×1
=16
5/12×28%×3/14
=5/12×(28%×3/14)
=5/12×3/50
=1/40

用分配率,5/14X14/25十5/14X28=1/5十10

5/14×(14/25+28)
=5/14×14/25+5/14×28
=1/5+10
=10又1/5
3/5×8/9÷5/8
=3/5×8/9×8/5
=64/75
7/9÷1/2÷35/36
=7/9×2×36/35
=8/5
=1又3/5
7÷70%
=7÷7/10
=7×10/7

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5/14×(14/25+28)
=5/14×14/25+5/14×28
=1/5+10
=10又1/5
3/5×8/9÷5/8
=3/5×8/9×8/5
=64/75
7/9÷1/2÷35/36
=7/9×2×36/35
=8/5
=1又3/5
7÷70%
=7÷7/10
=7×10/7
=10
4/23×16+16×19/23
=16×(4/23+19/23)
=16×23/23
=16
5/12×28%×3/14
=5/12×14/50×3/14
=1/40

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