问题 计算题 脱式计算。(1)24×5+80(2)(60+70)×3(3)420÷7×9(4)305-(213-208) 答案 (1)24×5+80=120+80=200(2)(60+70)×3=130×3=390(3)420÷7×9=60×9=540(4)305÷(213-208)=305÷5=61 选择题 We just need one of you for the game.youyour brother can join us.A.Both; and B.Neither;norC.Either;or D.Not only;hut also 查看答案 单项选择题 61.20钢的平均含碳量是()。A.20%B.2%C.0.2%D.0.02% 查看答案