=×12+×12依据:乘法分配律
=9+10
=
25×(1-)25×1-
24×24×()
①+×
②×(-)
③××
④-×
①21÷0.5÷0.6
②125×88
③2.5×32×12.5
④
⑤
⑥61×40%+38× +0.4
① ×
②3÷( × )
③1- ×
④ ×( )
⑤ × ×
⑥ ×[ ÷( )]