5*(3/5+2/7)*7简便运算 十万火急

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5*(3/5+2/7)*7简便运算十万火急5*(3/5+2/7)*7简便运算十万火急5*(3/5+2/7)*7简便运算十万火急5*(3/5+2/7)*7=5*7*(3/5+2/7)=35*(3/5+2

5*(3/5+2/7)*7简便运算 十万火急
5*(3/5+2/7)*7简便运算 十万火急

5*(3/5+2/7)*7简便运算 十万火急
5*(3/5+2/7)*7
=5*7*(3/5+2/7)
=35*(3/5+2/7)
=35*3/5+35*2/7
=7*3+5*2
=21+10
=31

5×(3/5+2/7)×7
=5×3/5×7+5×2/7×7
=21+10
=31

=5*3/5*7+5*2/7*7
=3*7+5*2
=21+10
=31

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