84+kw7

秋昨包312642*8+84简便运算 -
季独店17545209077 ______ =42*10-42*2+84 =420-84+84 望采纳,谢谢合作,祝您愉快!

秋昨包31269.9*84+8.4怎么简便计算? -
季独店17545209077 ______ 9.9*84+8.4 =99x8.4+8.4=(99+1)x8.4=100x8.4=840

秋昨包31261981+1982+1983+1984+1985+1986+1897=1984()=() -
季独店17545209077 ______[答案] 原式=1984*7 =13888

秋昨包31261/4+1/12+1/24+1/40+1/60+1/84+1/112能不能说清楚些 -
季独店17545209077 ______[答案] 1/4+1/12+1/24+1/40+1/60+1/84+1/112 =1/2*(1/2+1/6+1/12+1/20+1/30+1/42+1/56) =1/2*(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8) =1/2*(7/8) =7/16

秋昨包3126(84%+7.72)*(1 - 1\8)怎样简便算 -
季独店17545209077 ______ (84%+7.72)*(1-1\8) =8.56*7/8 =1.07*7 =7.49

秋昨包312684+47+395=多少要求列方程,写过程 -
季独店17545209077 ______ 列方程是解应用题的方法,算式计算不存在列方程.84+47+395=131+395=526

秋昨包312699/84+84可以用什么简便方法计算? -
季独店17545209077 ______[答案] 99*84+84 =(99+1)*84 =100*84 =8400

秋昨包312684+99*84的简便方法 -
季独店17545209077 ______[答案] 84+99*84 =1*84+99*84 =(1+99)*84 =100*84 =8400

秋昨包3126小学四年级第二期简便运算99+84+84 -
季独店17545209077 ______[答案] ..99+84+84 =(100-1)+84*2 =100+168-1 =268-1 =267