计算下面各题,怎样简便就怎样算.
135﹣l7﹣18 1489﹣382﹣18 376﹣(124+76)
1800÷45÷2 4700÷25÷4 (450﹣72)÷9.
(1)200÷2÷5 (2)9×(25+55) (3)72÷8×6 (4)6×19×5
(5)949﹣260×3 (6)2000﹣106×4 (7)(31+77)×9 (8)(206+103)÷3
(9)80﹣75÷5 (10)90+84÷4 (11)15×2×5.
计算:
①3×(x+9)=27
②16×8﹣7x=23
③7.5﹣7.5×0.5﹣2.6×0.8
④13.7×6.5+5.9×13.7﹣12.4×3.7
⑤50×[(0.2+4.8﹣4.8+0.2)÷2]
⑥11.25+21.25+31.25+41.25+51.25+61.25+71.25+81.25.
试题篮
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