列式计算．（1）比32的17倍少56的数是多少？（2）用7除830与242的差，商是多少？（3）计算减法时错把减数587当成578，结果为89．正确的差应是多少？
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=÷=
直接写得数： 1﹣=×=÷2÷= 2×80%=+= 15÷= 35×=×÷×=
直接写出得数．﹣=×= 12×= 1÷=== 1.6×4×0.25= 0÷=
+
=
﹣
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×2=
×
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÷3×
= 12×
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×14=
÷4=
+
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= 3
+1.75=
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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÷
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×6=
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×6=
×
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﹣
÷
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×
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= 6.4÷0.08= 4﹣2.92=
÷
=
=
×
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÷2÷
+
= 15÷
= 35×
=
×
÷
=
﹣
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×
= 12×
= 1÷
=
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= 1.6×4×0.25= 0÷
=
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