一、计算下面各题
90×12-800 252÷4+37 86×25+1850
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468÷6+278 145×28+107 905×32-1800
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200-15×8 200+16×7 200-150÷5
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900+105×8 3250-595÷7 396-25×6
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(200-15)×8 ( 200+16)×7 (200-150)÷5
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(900+105)×8 (3250-1150)÷7 (396-36)×6
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90×(12-8 ) 405÷(4+5) 86×(25+1850)
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468÷(569-563) 145×(28+107) 905×(32-18)
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85+125+508 7805-85-627 824+631-31
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285-25+508 6205÷5×36 24×31×56
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441÷7÷9 82×14÷4 824÷2×6
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