用简便方法计算．
7.85+6.76+2.15 18.43﹣3.76﹣7.24 21.65+（4.8﹣3.65）
9.64﹣（4.64﹣1.23） 2.7+17.6+3.3﹣5.6 9.87﹣3.5+2.13﹣8.5．
用简便方法计算．
7.85+6.76+2.15 18.43﹣3.76﹣7.24 21.65+（4.8﹣3.65）
9.64﹣（4.64﹣1.23） 2.7+17.6+3.3﹣5.6 9.87﹣3.5+2.13﹣8.5．
+
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= 3+
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= 0.7﹣0.62= 12÷25=
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×0= 13
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=
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= 1﹣
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