HELP~MY HOMEWORK IS VERY 1、运一批货物,第一天运走总数的2/5,第二天运走总数的25%,两次共运走1950千克.这批货物有多少千克?2、食堂运来一批煤,原计划每天烧1.25吨,8天可以烧完,如果每天烧煤量节
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HELP~MYHOMEWORKISVERY1、运一批货物,第一天运走总数的2/5,第二天运走总数的25%,两次共运走1950千克.这批货物有多少千克?2、食堂运来一批煤,原计划每天烧1.25吨,8天可
HELP~MY HOMEWORK IS VERY 1、运一批货物,第一天运走总数的2/5,第二天运走总数的25%,两次共运走1950千克.这批货物有多少千克?2、食堂运来一批煤,原计划每天烧1.25吨,8天可以烧完,如果每天烧煤量节
HELP~MY HOMEWORK IS VERY
1、运一批货物,第一天运走总数的2/5,第二天运走总数的25%,两次共运走1950千克.这批货物有多少千克?
2、食堂运来一批煤,原计划每天烧1.25吨,8天可以烧完,如果每天烧煤量节约20%,则可以烧多少天?用比例解.
3、一种机床每次按售价降低10%,经过两次降价后现售16200元,降价前首多少元?
HELP~MY HOMEWORK IS VERY 1、运一批货物,第一天运走总数的2/5,第二天运走总数的25%,两次共运走1950千克.这批货物有多少千克?2、食堂运来一批煤,原计划每天烧1.25吨,8天可以烧完,如果每天烧煤量节
第一题
设总数是x千克
2/5x+25%x=1950
x=3000
所以这批货物有3000千克
第三题
16200除以(1-10%)的平方
=20000元
SORRY,YOU MUST DO IT BY 自己~
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