口算下列各题．
72×60= 250×40= 73×20= 75×40=
81×50= 15×4= 43×200= 75×500=
600×50= 70×40= 92×50= 30×14=
59×42≈ 32×61≈ 993×19≈ 701×289≈
口算下列各题．
72×60= 250×40= 73×20= 75×40=
81×50= 15×4= 43×200= 75×500=
600×50= 70×40= 92×50= 30×14=
59×42≈ 32×61≈ 993×19≈ 701×289≈
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=
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=
=
=
=
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×
=
×12=
×
=
÷
=
÷
= 9×
=
÷
═
÷12=
=
=
=
=
=
=
=
×
=
﹣
= 0÷
=
= 70×
=
×
= 4×60%= 0×
=
÷2= 10÷
=
×3.6= 0.875÷0.125=
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