口算．
1000﹣60= 50×20= 250÷5= 17×200= 30×50×0= 290×30=
260÷1= 680÷4= 4.3+2.4= 7.3﹣3.5= 9+5.6= 8﹣3.5=
口算．
1000﹣60= 50×20= 250÷5= 17×200= 30×50×0= 290×30=
260÷1= 680÷4= 4.3+2.4= 7.3﹣3.5= 9+5.6= 8﹣3.5=
= 0.23=
=
=
=
= 45÷25÷4=
×4÷
= 1÷0.125﹣8=
×
÷
= 10×
=
﹣
=
×
=
÷1+
×
=（
）×6= 6.5×4×
=
×54．
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