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(225÷15+45)÷5怎样递等式来计算

解 (225÷15+45)÷5 =(15+45)÷5 =60÷5 =12

45×1.58+5.5×15.8 =4.5*15.8+5.5*15.8 =(4.5+5.5)*15.8 =10*15.8 =158

(1)195-(45+45÷9)=195-(45+5)=195-50=145;(2)58+7×15-4=58+105-4=163-4=159;(3)270÷(45-15 )=270÷30=9;(4)(79+21)×(96÷12)=100×8=800.

4又25分之8-15分之7×5分之3÷45分之7 =108/25-7/15×3/5×45/7 =108/25-9/5 =108/25-45/25 =63/25 =2又13/25 数学辅导团为您解答,不理解请追问,理解请及时选为满意回答!(*^__^*)谢谢!

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