一根电线长30米，第一次剪去4.8米，第二次剪去15.2米，这样和原来相比，短了多少米？
直接写出得数+=﹣=+= 1﹣=+==+=﹣= 3﹣=+= 3÷7= 43=
直接写得数．+= 3﹣1.75=÷=×=×=÷=÷=×0+3=（+）×=
直接写出得数．+=﹣=×2=×=÷3×÷3== 12×=×14=÷4=+÷+=
直接写得数+= 3+1.75=÷=×=×=﹣=+=×0+3= （+）×=×÷×=
口算下面各题．﹣=+=﹣= 2÷=×6=÷=×6=×=﹣=÷=÷=×=×=÷=÷= 6.4÷0.08= 4﹣2.92=÷=
+
=
﹣
=
+
= 1﹣
=
=
=
+
=
﹣
= 3﹣
=
+
= 3÷7= 43=
+
= 3
﹣1.75=
÷
=
×
×
=
÷
=
÷
=
×0+3=（
+
）×
=
+
=
﹣
=
×2=
×
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÷3×
= 12×
=
×14=
÷4=
+
+
+
= 3
+1.75=
÷
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×
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×
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﹣
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+
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×0+3=
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）×
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×
÷
×
﹣
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= 2÷
=
×6=
÷
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×6=
×
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﹣
÷
=
÷
=
×
=
×
=
÷
=
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= 6.4÷0.08= 4﹣2.92=
÷
=
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