直接写得数0.25×3=3.3×0.4=3.5×0.2=5.6÷8=5.1÷1.7=0×12.5=9.1÷1.3=0.81÷0.9=4.7+2.5=6.5-5.6=2a+
直接写得数0.25×3=3.3×0.4=3.5×0.2=5.6÷8=5.1÷1.7=0×12.5=9.1÷1.3=0.81÷0.9=4.7+2.5=6.5-5.6=2a+...
直接写得数0.25×3=3.3×0.4=3.5×0.2=5.6÷8=5.1÷1.7=0×12.5=9.1÷1.3=0.81÷0.9=4.7+2.5=6.5-5.6=2a+0.5a=15x+4x-13x=
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