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2.85×4.7列竖式计算

0.36 × 4.7 = 1.692≈1.69

如图

0.98 × 4.7 = 4.606

4.7×0.59≈2.8, 4.7 ×0.59 423 235 2.773 ;7.8÷2.2=3. ? 5 ? 4 , 3.54542.2 7.8 660 120 110 100 88 120 110 120 110 100 88 12 .

4.7×0.59=2.773;91.2÷0.57=160;1.38×0.27≈5.11;(得数保留两位小数)0.246÷0.17≈1.45;(得数保留两位小数)

(1)7.4+12.86=20.26; (2)20-5.674=14.326; (3)141.2-48.98=92.22; (4)102+4.36=106.36; (5)32.15-27.45=4.7; 验算: (6)12.9+5.01=17.91; 验算:

3.15÷4.7≈0.67

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