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1.每日速算。
$2.5x + 3.7x =$
$7.5x - x =$
$4.5 × 0.4 =$
$7 ÷ 4 =$
$\frac{3}{4} + \frac{1}{6} =$
$\frac{7}{10} - \frac{1}{5} =$
$\frac{1}{5} + \frac{1}{6} =$
$\frac{7}{8} - \frac{5}{24} =$
$2.5x + 3.7x =$
$7.5x - x =$
$4.5 × 0.4 =$
$7 ÷ 4 =$
$\frac{3}{4} + \frac{1}{6} =$
$\frac{7}{10} - \frac{1}{5} =$
$\frac{1}{5} + \frac{1}{6} =$
$\frac{7}{8} - \frac{5}{24} =$
答案
1.$6.2x$ $6.5x$ $1.8$ $\frac{7}{4}$ $\frac{11}{12}$ $\frac{1}{2}$ $\frac{11}{30}$ $\frac{2}{3}$
2.解方程。
$x - \frac{1}{9} = \frac{7}{8}$
$13×7 + 4x = 127$
$5.8x + 9.2x = 72$
$x - \frac{1}{9} = \frac{7}{8}$
$13×7 + 4x = 127$
$5.8x + 9.2x = 72$
答案
2.$x=\frac{71}{72}$ $x=9$ $x=4.8$
3.大象和小象的体重各是多少吨？（用方程解答）
答案
3.小象：0.7吨 大象：5.6吨
