18.直接写出得数.
2.7+23= | 99÷100= | 2.5×3.5×0.4= |
$\frac{7}{8}$÷$\frac{7}{10}$= | 5.4-180%= | 2.8-$\frac{4}{7}$+1.2= |
17.在2,4,7,8,中互质数有( )对.
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A. | 2 | B. | 3 | C. | 4 | D. | 1 |