`x xx2+x xx3+x xx4+x xx5+x xx6=340`
`x xx(2+3+4+5+6)=340`
`x xx20=340`
`x=340:20`
`x=17`
`X xx 2 + X xx 3 +X xx 4 + X xx 5 + X xx 6 = 340`
` X xx ( 2 + 3 + 4 + 5 + 6 )= 340`
` X xx 20 = 340`
` X = 320 : 20`
`X = 17`
`x xx2+x xx3+x xx4+x xx5+x xx6=340`
`x xx(2+3+4+5+6)==340`
`x xx20=340`
`x=340:20`
`=17.`
`#NguyetCat`
X x 2 + X x 3 + X x 4 + X x 5 + X x 6 = 340
X x ( 2+3+4+5+6) = 340
X x 20 = 340
X = 340 : 20
X = 17
Chúc bạn học tốt !
x×2+x×3+x×4+x×5+x×6=340x×2+x×3+x×4+x×5+x×6=340
x×(2+3+4+5+6)=340x×(2+3+4+5+6)=340
x×20=340x×20=340
x=340:20x=340:20
x=17