口算80﹣42= 18.2+8= 19﹣0.2= 1.8×0.4=24÷0.6= 21×= ﹣= 100×1%=1.25×8÷1.25×8= ×8+8×=
直接写出得数 78﹣0.98=（）2= 32×12.5%=÷= 2﹣+=+×13= 56×（+）=×÷×=
直接写出得数 2.2+3.57=（ ）2﹣（）2=+= 0.375×=÷1.5= 1×7= ：= 12.5×8.24×8=
直接写出得数．×12=+= 10×=﹣= 1÷= 12÷=÷=×=÷=÷= 18+46= 2.5×0.8= 3.8﹣0.9= 36÷2= 3.5÷0.5=
口算．==== 0.125×8== 0.37+1.3=== 2008×99+2008=
直接写出各题得数． 0.4÷40%= 0.64+3.6= 0.25×4= 0.56×=×= 5.6÷0.1%=÷2=×=÷3+3÷= 6.73×99+6.73=
= 
﹣
= 100×1%=
×8+8×
=
）2= 32×12.5%=
÷
= 2﹣
+
=
+
×13=
+
）=
×
）2﹣（
）2=
+
= 0.375×
=
÷1.5= 1
×7
=
=
12.5×8.24×8=
×12=
+
= 10×
=
﹣
= 1÷
=
=
÷
=
×
=
÷
=
=
=
=
=
= 0.37+1.3=
=
= 2008×99+2008=
=
×
÷2=
×
=
÷3+3÷
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