问题 解答题 28+47=4-3.3=120×30=3.6÷0.12=0.12=12+34=34×29=24÷38= 答案 28+47=754-3.3=0.7120×30=36003.6÷0.12=300.12=0.0112+34=11434×29=1624÷38=64