资源描述
32×23+52 52+18×12 34×19-18
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16×28+34 11×12+10 137×21-61
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61+12×230 43+121×23 45+132×25
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125×31+20 148+52×21 287+35×100
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99+146×90 180×33+100 8000-100×76
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138+50×40 160+81×90 199+50×56
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56×76+56 18×11+2 51×87+300
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