解方程上面是怎么样简便就怎么样算,写在本子上发过来快点么么哒 20
2个回答
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1.(7.25*40%+2.75*2/5)/(20%)
=0.4*(7.25+2.75)*100/20
=4*5
=20
2.10%*13/14+1.8*13/14-9/10/(14/13)
=13/14*(0.1+1.8-0.9)
=13/14*1
=13/14
3. (1/2-1/3*75%)/(25%)
=(1/2-1/4)*4
=1/4*4
=1
4. [2-(2-50%*1/4)]/(25%)
=[2-1/8]*4
=15/8*4
=7.5
解方程:
3/4*x-40%x=1.4
35%*x=1.4
35x=140
x=4
5.2*40%+40%x=7.6
0.4x=7.6-2.08=5.52
x=18.3
=0.4*(7.25+2.75)*100/20
=4*5
=20
2.10%*13/14+1.8*13/14-9/10/(14/13)
=13/14*(0.1+1.8-0.9)
=13/14*1
=13/14
3. (1/2-1/3*75%)/(25%)
=(1/2-1/4)*4
=1/4*4
=1
4. [2-(2-50%*1/4)]/(25%)
=[2-1/8]*4
=15/8*4
=7.5
解方程:
3/4*x-40%x=1.4
35%*x=1.4
35x=140
x=4
5.2*40%+40%x=7.6
0.4x=7.6-2.08=5.52
x=18.3
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