Toán (X +2) –40=2 2x+15=31 2*(x+3)=10 3*(x-15)+12=42 25/07/2021 By Everleigh (X +2) –40=2 2x+15=31 2*(x+3)=10 3*(x-15)+12=42
Đáp án: Giải thích các bước giải: $(x+2)-40=2$ $⇔x+2=42$ $⇔x=40$ $2x+15=31$ $⇔2x=16$ $⇔x=8$ $2(x+3)=10$ $⇔x+3=5$ $⇔x=2$ $3(x-15)+12=42$ $⇔3(x-15)=30$ $⇔x-15=10$ $⇔x=25$ Trả lời
`(x +2) –40=2` `=> x+2=2+40=42` `=> x=42-2=40` `2x+15=31` `=> 2x=31-15=16` `=> x=16:2=8` `2.(x+3)=10` `=> x+3=10:2=5` `=> x=5-3=2` `3(x-15)+12=42` `=> 3(x-15)=42-12=30` `=> x-15=30:3=10` `=> x=10+15=25` Trả lời
Đáp án:
Giải thích các bước giải:
$(x+2)-40=2$
$⇔x+2=42$
$⇔x=40$
$2x+15=31$
$⇔2x=16$
$⇔x=8$
$2(x+3)=10$
$⇔x+3=5$
$⇔x=2$
$3(x-15)+12=42$
$⇔3(x-15)=30$
$⇔x-15=10$
$⇔x=25$
`(x +2) –40=2`
`=> x+2=2+40=42`
`=> x=42-2=40`
`2x+15=31`
`=> 2x=31-15=16`
`=> x=16:2=8`
`2.(x+3)=10`
`=> x+3=10:2=5`
`=> x=5-3=2`
`3(x-15)+12=42`
`=> 3(x-15)=42-12=30`
`=> x-15=30:3=10`
`=> x=10+15=25`