9.1÷(1.3×28)用简便算法计算急

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9.1÷(1.3×28)用简便算法计算急

9.1÷(1.3×28)用简便算法计算急
9.1÷(1.3×28)用简便算法计算

9.1÷(1.3×28)用简便算法计算急
9.1÷(1.3×28)
=9.1÷(1.3×4×7)
=9.1÷1.3÷4÷7
=9.1÷7÷1.3÷4
=1.3÷1.3÷4
=1/4

=9.1/1.3/28=7/28=1/4=0.25

9.1÷1.3÷28=7÷28=0.25

9.1÷(1.3×28)
=9.1÷(1.3×4×7)
=9.1÷1.3÷4÷7
=9.1÷7÷1.3÷4
=1.3÷1.3÷4
=1/4
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