题目

用递等式计算,能简算的要简算。 ①4920÷24-17×12 ②0.25 ×6.7×4 ③ × - ÷ ④9.43-(1.74+1.43) ⑤ ⑥ ÷[( + )×2] 答案:①4920÷24-17×12=205-204=1②0.25×6.7×4=0.25×4×6.7=1×6.7=6.7③72×58-32÷85=72×58-32×58=72-32×58=2×58=54④9.43-(1.74+1.43)=9.43-1.43-1.74=8-1.74=6.26⑤19+38×72=19×72+38×72=8+27=35⑥45÷35+12×2=45÷1110×2=45÷115=411
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