括号125×18+82括号除以4用巧算

括号125×18+82括号除以4用巧算

(125×18+82)÷4
=【125×(16+2)+82】÷4
=(125×16+125×2+82)÷4
=(125×8×2+250+82)÷4
=(1000×2+322)÷4
=2322÷4
=580.5
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