脱式计算,能简算的要简算①2006-4848÷96×2.4 ②31.9×18-8×31.9 ③ 13 14 + 13
脱式计算,能简算的要简算①2006-4848÷96×2.4②31.9×18-8×31.9③1314+1315+114+215④89×[34-(1516-34)]....
脱式计算,能简算的要简算①2006-4848÷96×2.4 ②31.9×18-8×31.9 ③ 13 14 + 13 15 + 1 14 + 2 15 ④ 8 9 ×[ 3 4 -( 15 16 - 3 4 )].
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①2006-4848÷96×2.4, =2006-50.5×2.4, =2006-121.2, =1884.8; ②31.9×18-8×31.9, =31.9×(18-8), =319; ③
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=1+1, =2; ④
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