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+选题
5.7×0.565.7 18÷18 a ×150%a
A. π:4 B. 4: π C. π:2 D.2:π
7.2 ×=
=
2.5 × 80% =
45% +=
15.7 ÷ 3.14 =
÷ 0.2 =
3.5 ÷=
(+)× 24
101 ×
70%x + x = 51 8.9 + 2x = 11.1 21÷ x =
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