999×七分之五+666×七分之三怎样简算?急

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999×七分之五+666×七分之三怎样简算?急
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999×七分之五+666×七分之三怎样简算?急
999×七分之五+666×七分之三怎样简算?急

999×七分之五+666×七分之三怎样简算?急
999*5/7+666*3/7
=333[(3*5/7)+2*(3/7)]
=333*21/7
=999

999*5/7+666*3/7=333*3*5/7+333*2*3/7=333/7*(3*5+2*3)=333/7*21=333*3=999
修改:
999*5/7+666*3/7
=999*5/7+333*2*3/7
=999*5/7+999*2/7
=999*(5/7+2/7)
=999*1
=999

999*5/7+666*3/7=333*3*5/7+333*2*3/7=333*3*(5/7+2/7)=999

999×七分之五+666×七分之三=333×3×5/7+333×2×3/7=333×15/7+333×6/7=333×(15/7+6/7)=333×3=999

999*5/7+666*3/7
=333[(3*5/7)+2*(3/7)]
=333*21/7
=999

999×21+666×45-333×53
=333×3×21+333×2×45-333×53
=333×﹙63+90-53)
=333×100
=33300