问题 解答题 5+4.5=0.67-0.47=0.3×0.3=0.7÷100=4-0.4=0.82+0.18=9÷0.9=1.4×100= 答案 5+4.5=9.50.67-0.47=0.20.3×0.3=0.090.7÷100=0.0074-0.4=3.60.82+0.18=19÷0.9=101.4×100=140.