"84-80除以16×5等于几"...84-80除以16×5等于几

　"84-84除以4等于几"...84-84除以4等于几

　"84除以4+79等于几"...84除以4+79等于几

　"84-70除以84等于几"...84-70除以84等于几

　"84+28除以4等于几"...84+28除以4等于几

　"84除以4=多少42×2等于几"...84除以4=多少42×2等于几

　"840-84除以4等于几"...840-84除以4等于几

　"84除以4-10等于几"...84除以4-10等于几

　"84-80除以16×12等于几"...84-80除以16×12等于几

　"84-84除以84+80等于几"...84-84除以84+80等于几