90.7*99.90.7 简算
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90.7*99.90.7简算90.7*99.90.7简算90.7*99.90.7简算90.7*99+90.7=90.7*(99+1)=90.7*100=907090.7*99+90.7=90.7x(9
90.7*99.90.7 简算
90.7*99.90.7 简算
90.7*99.90.7 简算
90.7*99+90.7
=90.7*(99+1)
=90.7*100
=9070
90.7*99+90.7
=90.7x(99+1)
=90.7x100
=9070