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a×0.99=b×1.01=c×0.85
(32×0.63×0.95)÷(1.6×21×1.9)
347×6.9+653×3.1+306×1.9
a÷0.99=b×0.99
(1.99+19.9)×3+0.33
a×0.99=b×1.02=c
942×5.9-920×6.1
2×0.1+6×0.9+8×1.8
99.8²-0.2²
φ(1.96)=0.975
40×9.9+0.3+99等于几
2999×1.998-199.8×9.99
√100×0.9/0.36×121
1.1×7/99
(-0.9)+(+1.5)
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