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.
①300﹣10﹣9.8﹣9.6﹣9.4﹣9.2﹣…﹣0.8﹣0.6﹣0.4﹣0.2
②4.23×7.12+42.3×0.398﹣0.432×11.
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.
(78.6﹣0.786×25十75%×21.4)÷15×1997
8888008×125
2001×3.14+200.1×31.4+20.01×314
0.525÷13.125÷4×85.2.
6.4×2.5+2×3.4+25% 15.7×7.7+1.57×22+1.57
12.56﹣(+2.56+) ×﹣×
2010× 3.65÷〔0.1÷(2.1﹣2.09)〕
试题篮
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