递等式能巧算的要巧算 0.49[1/(4.9-4.89)]+6 38.2*7.5+75+0.75*518

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递等式能巧算的要巧算 0.49[1/(4.9-4.89)]+6 38.2*7.5+75+0.75*518

0.49[1/(4.9-4.89)]+6 =0.49÷0.1+6=0.49+6=6.49
38.2*7.5+75+0.75*518=0.75×(382+518)=0.75×900=675