仔细观察,选择合适的方法计算.
(1)63+24+37 (2)65+42+44 (3)18+36+72 (4)78+15+85 (5)28+34+66
(6)35+44+56 (7)232﹣48﹣52 (8)318﹣63﹣37 (9)427﹣39﹣27 (10)385﹣(78+85)
(11)63﹣9﹣9﹣9(12)500﹣97﹣98﹣99(13)700﹣101﹣102 (14)351﹣(151+56)(15)49+49+49+49
(16)72+54+28+45 (17)1+2+3+4+5+6+7 (18)6+17+18+19 (19)0+2+4+6+8+10+12 (20)3+6+9+12+15+18+21.
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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