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4/7×0.5÷6/7
4^2×3.14×2
4/9×62.5%+4/9×3/8
-4/7×3.59-4/7×2.41+4/7×(-3)
4/7×1/4+0.25×3/7
4/3×2.4
4/5÷0.4
4/3×3.14
4/5÷0.625÷(1/4)
4/5×7.4-4/5+3.6×0.8
4.6×-×=19.44
4.5ⅹ+ⅹ=11/17
4.5㎡=()d㎡
4/9×0.25
45×1/4+54×0.25+25%
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