Question

脱式计算1/2—3/4乘5/61/3乘3/5+15/7—5/9乘5/31/2+5/4乘4/51/6乘（5—2/3）7/8

Answer 1

1/2-3/4×5/6

=1/2-5/8

=-(1/8)

1/3x3/5+1

=1/5+1

=6/5

5/7-5/9×5/3.

=5/7-25/27

=135/189-125/189

=10/189

1/2+5/4×4/5

=1/2+1

=3/2

1/6×(5-2/3)

=1/6×13/3

=13/18

7/8×7+3/8

=49/8+3/8

=52/8=13/2

1-5/7×21/25

=1-3/5

=2/5

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