7.5*23+31*2.5简便运算 0.79*0.46+7.9*0.24+11.4*0.079的简便运算_数学解答

7.5*23+31*2.5简便运算 0.79*0.46+7.9*0.24+11.4*0.079的简便运算

人气：256 ℃　时间：2019-09-02 19:56:40

解答

7.5*23+31*2.5=2.5*3*23+31*2.5=2.5*69+31*2.5=2.5*(69+31)=2.5*100=2500.79*0.46+7.9*0.24+11.4*0.079=0.79*0.46+0.79*2.4+0.79*1.14=0.79*(0.46+2.4+1.14)=0.79*4=3.16