6个男生的平均体重是40千克，4个女生的平均体重是30千克，这10个同学的平均体重是多少千克？
×= 1÷= 4×60%= 0.875÷0.125=÷2= 10÷= ×3.6= 0×=
直接写得数．= = 1÷40%== = 72×25%==
直接写出下列题目的得数．7+66.3= ÷= ×÷=14÷= ÷20%= （+）×20=
口算．============
直接写得数×12= 0.45×2= 34×0.2= ÷2=10×= 9.9+2.43+0.1= ×= 6.8×2.5=
×
= 1÷
= 4×60%= 0.875÷0.125=
= 
×3.6= 0×
=
= 
= 1÷40%=
= 
= 72×25%=
=
÷
= 
×
÷
=
= 
÷20%= （
+
）×20=
=
=
=
=
=
=
=
=
=
=
=
=
×12= 0.45×2= 34×0.2= 
÷2=
= 9.9+2.43+0.1= 
×
= 6.8×2.5=
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