四年上册数学《简便运算》专项练习① 14+549+151 =14+(549+151) =14+700 =714 48×102 =48×(100+2) =4800+96 =4896 986+(314+49) =(986+314)+49 =1300+49 =1349 14×44+36×44 =(14+36)×44 =50×44 =2220 167×43−67×43 =(167−67)×43 =100×43 =4300 847+(466+853) =847+853+466 =1700+466 =2166 59×20+20 =(59+1)×20 =60×20 =1200 36×79+36 =(79+1)×36 =80×36 =2880 31×79+31 =(79+1)×31 =80×31 =2480 566+67+234 =566+234+67 =800+67 =867
