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数学勇者之王进来啊125×36-3603.6÷36(这道要简算)25分之8+x=2分之x1/12+1/20+1/30+1/42+1/56+1/72+1/90(这道要简算)有一根电线,截去全长的3分之1后,再接上24米这时比原来电线长了20%,原来这根电
题目详情
数学勇者之王进来啊
125×36-3603.6÷36 (这道要简算) 25分之8+x=2分之x
1/12+1/20+1/30+1/42+1/56+1/72+1/90
(这道要简算)
有一根电线,截去全长的3分之1后,再接上24米这时比原来电线长了20%,原来这根电线长多少米?
125×36-3603.6÷36 (这道要简算) 25分之8+x=2分之x
1/12+1/20+1/30+1/42+1/56+1/72+1/90
(这道要简算)
有一根电线,截去全长的3分之1后,再接上24米这时比原来电线长了20%,原来这根电线长多少米?
▼优质解答
答案和解析
125×36-3603.6÷36
=125×36-(3600+3.6)÷36
=125×36-(3600÷36+3.6÷36)
=125×36-(100+0.1)
=125×8×4.5-100.1
=1000×4.5-100.1
=4500-100-0.1
=4400-0.1
=4399.9
25分之8+x=2分之x
0.32+x=0.5x
0.5x-x=0.32
-0.5x=0.32
x=0.32÷-0.5
x=
=125×36-(3600+3.6)÷36
=125×36-(3600÷36+3.6÷36)
=125×36-(100+0.1)
=125×8×4.5-100.1
=1000×4.5-100.1
=4500-100-0.1
=4400-0.1
=4399.9
25分之8+x=2分之x
0.32+x=0.5x
0.5x-x=0.32
-0.5x=0.32
x=0.32÷-0.5
x=
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