很快算出得数。
⑴5+0.4=   ⑵1.4+2.7=   ⑶8.2+3.7=   ⑷5+2.4=   ⑸2.7﹣1.8=    ⑹7.3+0.9= ⑺2+5.3=   ⑻2.0+1.8=   ⑼5.7+2.8=   ⑽6+2.2=   ⑾1.5+8.5=    ⑿7.4+1.6= ⒀6.5﹣5=  ⒁3.2﹣2.3=  ⒂4.2﹣2.2=  ⒃2.3﹣2=