- What can she do? - She can skip rope.
A:
B:
① 78−35+18−25 =____ ② 56÷710×57 =____
③ (1112−16)÷118×13 =____ ④ 14×1439−1439÷14 =____
⑤ 119÷3225−(32.4−13×0.25)×12 =____
⑥ 2012−614×252+123÷416 =____
①CH4(C2H4)____
②CH3CH2OH(H2O)____
③乙酸乙酯(乙酸)____
④溴苯 (溴)____
⑤氯化钠 (泥沙)____.
人口增长过快带来的问题是( )