（1）270里有多少个30？（2）58个31是多少？
2.5+3.7= 217÷7= 70﹣34= 1.2×0.5= 1.3+27= 1.5÷0.5= 4.5﹣0.5=25×0.4=========
直接写出得数： 103.5﹣83=÷2= 1﹣40%=﹣= 0÷= 1﹣25%﹣70%=
直接写得数 2.2+3.57= 11.3﹣8.6= 3.25×4= 14÷35=÷6=﹣=×=÷=+=﹣=
直接写出得数． 25+7.5= 200×3.6= 217﹣18=+×5= 42÷0.02= 3﹣=÷=（+）×56=
直接写出得数． 0.78+0.22=== 0÷= 3+5%+17%== 0.43+0.17+0.39= 8.4+= 0.1÷0.01= 1.2×= 32×2.5== 742﹣299= 101×9.2﹣9.2===
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÷2= 1﹣40%=
﹣
= 0÷
= 1﹣25%﹣70%=
÷6=
﹣
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×
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÷
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+
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﹣
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×5=
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=（
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）×56=
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= 0÷
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= 0.43+0.17+0.39= 8.4+
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= 32×2.5=
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