用短除法求72和90的最大公因数．
直接写出得数．×4= 0.8÷0.01= 0.6÷= 0.37+2.73=+= ÷2= 112= 20×5.5=
×80% 1﹣78% 100﹣56% ÷40%60%×70% 8.7×45% 1+1% 25×．1.2+20%+ ×90% 8×（1+25%） 80%÷．
口算15÷0.25= 1.5×= ×1.8= 2.5×0.4= 32×2.5=24×= 2.4+1.6= ÷= ×= ÷25%=
直接写得数．2.4×50%= += 5.8﹣0.89= 0.52=÷10= 3.9×1.1= （+）×12= 1﹣+=
3.26+2.4= = = 3.6÷0.6=1﹣0.52= 2.5×3.5×0.4= = =
×4= 0.8÷0.01= 0.6÷
= 0.37+2.73=
+
= 
÷2= 112= 20×5.5=
×80% 1﹣78% 100﹣56% 
÷40%
×90% 8×（1+25%） 80%÷
= 
×1.8= 2.5×0.4= 32×2.5=
= 2.4+1.6= 
÷
= 
×
= 
÷25%=
+
= 5.8﹣0.89= 0.52=
÷10= 3.9×1.1= （
+
）×12= 1﹣
+
=
= 
= 3.6÷0.6=
= 
=
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