80÷4= 40÷4= 60÷3= 50÷5=33÷3= 42÷2= 70÷7= 90÷2=
470÷2.5÷40．
0.8××1.25×4．
752×1.25+4.45×12.5+0.035×125．
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4.95×99+4.95．
×1.25×4．
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