摘要:口算.6% 23+78= 124―83= 35×20 = 440÷44= 78―71= 25×40= 125×8= 450÷30= 560÷70= 66×30= 8400÷21= 3600÷40=
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口算
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| 120÷6= | 30×10= | 3000÷5= | 300÷3= | 69÷3= |
| 2000÷4= | 550÷5= | 15×6= | 53×20= | 700×60= |
| 134÷7≈ | 92×78≈ | 42×39≈ | 570÷8≈ | 491÷4≈ |