口算．10﹣4.2= 7.1﹣3.9= 4.3﹣4= 3.8+1.4=5.7+1.8= 2.7﹣1.7= 0.5+8.5= 3.6﹣0.9=
+-
1--
口算。+=-=+=-+= 0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
×=÷3=÷=－= 3÷15=＋0.25= 1÷= 85%－15%= 10÷10%= 5×÷5×=
脱式计算下面各题。 4÷-0.6×÷ （+）÷÷[1÷(-)]
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×
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÷3=
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÷5×
-0.6
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）÷
÷[1÷(
-
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