tìm x
a,x+1/5-3/7=6/35
b,x*4+x/3=39
c,x*3-x/4=33
*đây là dấu nhân
tìm x a,x+1/5-3/7=6/35 b,x*4+x/3=39 c,x*3-x/4=33 *đây là dấu nhân
By Aaliyah
By Aaliyah
tìm x
a,x+1/5-3/7=6/35
b,x*4+x/3=39
c,x*3-x/4=33
*đây là dấu nhân
Đáp án:
a) x+15−37=635x+15-37=635
x+15=635+37x+15=635+37
x+15=35x+15=35
x=35−15x=35-15
x=25x=25
b) x×4+x3=39x×4+x3=39
x×4+x×13=39x×4+x×13=39
x×(4+13)=39x×(4+13)=39
x×133=39x×133=39
x=39:133x=39:133
x=9x=9
c) x×3−x4=33x×3-x4=33
x×3−x×14=33x×3-x×14=33
x×(3−14)=33x×(3-14)=33
x×114=33x×114=33
Đáp án:
a) `x+1/5-3/7=6/35`
`x+1/5=6/35+3/7`
`x+1/5=3/5`
`x=3/5-1/5`
`x=2/5`
b) `x\times4+x/3=39`
`x\times4+x\times 1/3=39`
`x\times(4+1/3)=39`
`x\times13/3=39`
`x=39:13/3`
`x=9`
c) `x\times3-x/4=33`
`x\times3-x\times1/4=33`
`x\times(3-1/4)=33`
`x\times11/4=33`
`x=33:11/4`
`x=12`