⑴1-0.58= ⑵0.22= ⑶0.1:0.01= ⑷0.125×80= ⑸12÷=
①7.3-2.05+0.82
②3×÷3×
③3.68×6.7+ 63.2×0.67
①x+25%x=40
②:14=x:6.3
③2x+=
科技书有120本,比故事书本数的多12本。故事书有多少本?