3.6:2.8
=36:28;=9:7;9分之5:3分之8=5:24; 12分之5:5分之6
=5×5:6×12
=25:72;
【28+7分之3】*7分之3
=28×3/7+3/7×3/7
=12+9/49;
=12又49分之9;
【6.4-11分之6除以33分之8】除以2
=(6.4-6/11×33/8)÷2
=(6.4-2.25)÷2
=2.075;
9分之5*3.56+3.56*9分之4=3.56×(5/9+4/9)
=3.56×1
=3.56;
25-【12分之5+12分之1】*48
=25-48×5/12-48×1/12
=25-20-4
=1;
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