【1000×(0.675-8分之3)+2又4分之1×2又9分之7】÷6.25 算式(可以是简便运算)

2025-01-08 09:20:02
推荐回答(2个)
回答1:

【1000×(0.675-8分之3)+2又4分之1×2又9分之7】÷6.25
=【1000×(0.675-3/8)+9/4×25/9】÷25/4
=【675-375+25/4】×4/25
=【300+25/4】×4/25
=300×4/25+25/4×4/25
=48+1=49
1、340÷﹙9/8-7/10﹚=340÷﹙1/5﹚=1700
2、﹙¼+1/5﹚=1440米
3、赚了:240-240÷﹙1+0.2﹚=40元
亏了:240÷﹙1-0.2﹚-240=60元
所以卖这两件商品亏了20元
4、甲拿出5分之1给乙后,乙拿出3分之1给甲,那么甲本身剩下5分之4,且又拿回:给出5分之1的3分之1、及乙的3分之1
设:甲乙原来分别有x、y元
则13x/15+y/3=180
2x/15+2y/3=180解得x=112.5,y==247.5

回答2:

[1000×(0.675-8分之3)+2又4分之1×2又9分之7]÷6.25

=[675-375+9/4*25/9]÷25/4
=[300+25/4]*4/25
=12+1
=13
1、解:设这堆砖原有X块
(1-3/10)x+340=(9/8)x
(9/8-7/10)x=340
(17/40)x=340
x=800(块)
2、第一天修 3200*1/4=800(米) 第二天修 (3200-800)*1/5=480(米) 第三天 3200-800-480=1920(米) 第三天从1920米开始修。
3、240*(1+1/5)=288元 240*(1-1/5)=192元 288+192=480元 240*2=480元 不赔不赚
4、解:设甲原来有x元 乙有 360-x 元
(1-1/5)x+(1/3)[(360-(1-1/5)x]=180
(4/5)x+(1/3)[360-(4/5)x]=180
(4/5)x+120-(4/15)x=180
(12-4)/15*x=60
x=60*(15/8)
x=112.5(元)

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