1.估算下列各题。

$\frac{7}{12} \times \frac{40}{7} \approx$ $3.7 - \frac{5}{6} \approx$ $\frac{4}{9} \div \frac{10}{19} \approx$
$8 + \frac{7}{5} \approx$
$\frac{7}{12} \times \frac{40}{7} \approx$ $3.7 - \frac{5}{6} \approx$ $\frac{4}{9} \div \frac{10}{19} \approx$
$8 + \frac{7}{5} \approx$
答案:

$\frac{7}{12}\times\frac{40}{7}\approx3$
$3.7-\frac{5}{6}\approx3$
$\frac{4}{9}+\frac{10}{19}\approx0.8$
$8+\frac{7}{5}\approx9$

(估算答案不唯一)
$\frac{7}{12}\times\frac{40}{7}\approx3$
$3.7-\frac{5}{6}\approx3$
$\frac{4}{9}+\frac{10}{19}\approx0.8$
$8+\frac{7}{5}\approx9$
(估算答案不唯一)
2. 在$\bigcirc$里填上“$>$”或“$<$”。
$\frac{3}{5} + \frac{4}{7} \bigcirc 1$ $23.9 \times 9.9 \bigcirc 240$ $14.5 \times 0.99 \bigcirc 14.6$
$38 \div 1.01 \bigcirc 38$ $5.38 \times 2.01 \bigcirc 10$ $3.9 \times 5.98 \bigcirc 24$
$60 - 10.5 - 20.1 \bigcirc 30$ $5.4 + 5.1 + 5 + 5.2 \bigcirc 20$ $\frac{2}{5} \div 0.5 \bigcirc 1$
$\frac{5}{9} \div 0.5 \bigcirc 1$ $100 - 19.8 - 49.9 \bigcirc 30$ $3.7 - \frac{2}{3} \bigcirc 3$
$14.8 \times \frac{73}{74} \bigcirc 15 \times \frac{100}{99}$ $0.42 \times 10.1 \bigcirc 4.2$ $4.71 + 5.03 \bigcirc 10$
$90 \div 2.7 \bigcirc 30$ $642 \div 80 \bigcirc 8.8$ $6.3 \times 2.7 \bigcirc 20 \div 0.9$
$\frac{3}{5} + \frac{4}{7} \bigcirc 1$ $23.9 \times 9.9 \bigcirc 240$ $14.5 \times 0.99 \bigcirc 14.6$
$38 \div 1.01 \bigcirc 38$ $5.38 \times 2.01 \bigcirc 10$ $3.9 \times 5.98 \bigcirc 24$
$60 - 10.5 - 20.1 \bigcirc 30$ $5.4 + 5.1 + 5 + 5.2 \bigcirc 20$ $\frac{2}{5} \div 0.5 \bigcirc 1$
$\frac{5}{9} \div 0.5 \bigcirc 1$ $100 - 19.8 - 49.9 \bigcirc 30$ $3.7 - \frac{2}{3} \bigcirc 3$
$14.8 \times \frac{73}{74} \bigcirc 15 \times \frac{100}{99}$ $0.42 \times 10.1 \bigcirc 4.2$ $4.71 + 5.03 \bigcirc 10$
$90 \div 2.7 \bigcirc 30$ $642 \div 80 \bigcirc 8.8$ $6.3 \times 2.7 \bigcirc 20 \div 0.9$
答案:
$>$ $<$ $<$
$<$ $>$ $<$
$<$ $>$ $<$
$>$ $>$ $>$
$<$ $>$ $<$
$>$ $<$ $<$
$<$ $>$ $<$
$<$ $>$ $<$
$>$ $>$ $>$
$<$ $>$ $<$
$>$ $<$ $<$
查看更多完整答案,请扫码查看