【葳】評論
(-5)*[7*(-9)-(-10)/(-2)]=(-5)*[(-63)-5]=(-5)*(-68)=340
【葳】評論
(-5)*[7*(-9)-(-10)/(-2)]=(-5)*[(-63)-5]=(-5)*(-68)=340
【nomi】評論
(B)340(-5)×〔7×(8-17)-(9-19)÷(-2)〕= (-5)×〔7×(-9)-(-10)÷(-2)〕= (-5)×〔7×(-9)-(10)÷(2)〕= (-5)×〔-63-5〕= (-5)×〔-68〕= (5)×(68)= 340