用递等式进行计算,能简便的要简便简便计算. 0.25×(0.4+40) 0.67+1.28+9.33+0.72 3.18
用递等式进行计算,能简便的要简便简便计算.0.25×(0.4+40)0.67+1.28+9.33+0.723.18-(0.33+1.18)[1-(0.5-0.25)]×0...
用递等式进行计算,能简便的要简便简便计算. 0.25×(0.4+40) 0.67+1.28+9.33+0.72 3.18-(0.33+1.18) [1-(0.5-0.25)]×0.6
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(1)0.25×(0.4+40), =0.25×0.4+0.25×40, =0.1+10, =10.1; (2)0.67+1.28+9.33+0.72, =(0.67+9.33)+(1.28+0.72), =10+2, =12; (3)3.18-(0.33+1.18), =3.18-0.33-1.18, =(3.18-1.18)-0.33, =2-0.33, =1.67; (4)[1-(0.5-0.25)]×0.6, =[1-0.25]×0.6, =0.75×0.6, =0.45. |
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