口算 1﹣+0.8= 7.4﹣（1+）= 1﹣﹣= 1.25×7×8= 12÷3=0.25×0.4= 4.4﹣3= 4÷0.25= 3÷10%= 11×6=+1÷2= ×（1﹣）= 2×0.75= ÷= 5÷25÷0.4=0.8××5= ÷×= （0.18+）÷9= ×÷×= ×÷=
直接写出得数． 40×30= 90÷3= 100+25= 0÷8= 181÷2=+= 1﹣= 360÷6= 20×7= 79×2=
直接写出得数． 6.4﹣4== 0.25×12=== 4.8÷0.1===
直接写出得数． 0.83+0.27= 2.9×100= 50÷1000= ×10=0.7 80÷ =0.8+= 5.6+4= 0.13×1000=﹣0.35=
直接写出得数．+=﹣+=+=﹣=+=+=++=﹣=+= 3﹣﹣=
直接写出得数﹣=﹣=﹣=+=+=﹣=+=﹣=
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﹣
+0.8= 7.4﹣（1
+
）= 1
﹣
﹣
= 1.25×7×8= 12
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×6=
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= 
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÷
= 5÷25÷0.4=
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