用简便方法计算下面各题. 3.06-2.5+1.94 3.8+3.98+6.02 9.53-(4.53+2.4) 76-9.36-30.64 2.29+3.7+6.7
用简便方法计算下面各题.3.06-2.5+1.943.8+3.98+6.029.53-(4.53+2.4)76-9.36-30.642.29+3.7+6.71+6.33....
用简便方法计算下面各题. 3.06-2.5+1.94 3.8+3.98+6.02 9.53-(4.53+2.4) 76-9.36-30.64 2.29+3.7+6.71+6.3 3.25-0.13-1.25-0.87.
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=(2.29+6.71)+(3.7+6.3)慎做, =9+10, =19; (6)3.25-0.13-1.25-0.87, =3.25-1.25-(0.13+0.87), =2-1, =1. |
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