已知∠1=45°（1）∠2= ∠3= ∠4= （2）∠2的度数比∠1大 ．（3）∠2的度数是 的度数和．
× =1.5× =× =1．
× =5× = ×=7÷ =1．
在横线里填上适当的数．（90﹣60）× =150 408÷8+ =100（960﹣60）÷ =5 ×（54﹣48）=726．
﹣ = ×=1．
商与除数的积，一定不等于被除数． ．
× =1.5× =
× =1．
× =5× = ×
=7÷ =1．
= ×
=1．
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