A:Yes,I do
B:Of course,I have
C:A quarter to te
D:No problem
同学们在进行比较水和沙子的吸热能力的探究实验.
①3.68﹣0.82﹣0.18
②22.5×0.48+77.5×0.48
③36×( 29 + 712 )
④3 25 ﹣ 17 + 35 ﹣ 67 .