29×【1÷3】+1/3= 4.2:5.6=7:x
1个回答
29×【1÷3】+1/3
=1/3×(29+1)
=1/3×30
=10
4.2:5.6=7:x
4.2x=5.6×7
4.2x=39.2
x=39.2÷4.2
x=28/3
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