Question

数学问题！！急

Answer 1

更新1:

wan168338．．．．．．．．．．．．．．．．．．．．

26. 2(4-2x)-15(2-x)=22 8-4x-30+15x =22 11x-22=22 11x=44 x=4 27. 5(0.4-3)+7(1.5x-7)+4=2.5x 2-15+10.5x-49+4=2.5x -58+10.5x=2.5x 8x=58 x=7.25 28. 8[2(6x-4)-(4+3x)]=120+18x 8[12x-8-4-3x]=120+18x 96x-64-32-24x=120+18x 72x-96= 120+18x 54x=216 x=4
26) 2(4-2x)-15(2-x)=22 8-4x-30+15x=22 11x=22 x=4 27) 5(0.4-3)+7(1.5x-7)+4=2.5x 2-3+10.5x-49+4=2.5x -46=-8x x=5.75 28) 8[2(6x-4)-(4+3x)]=120+18x 8[12x-8-4-3x]=120+18x 96x-64-32-24x=120+18x 54x=216 x=4 29) 7x/4+1=9x/8+11 7x/4-9x/8=11-1 32(7x/4-9x/8)=32(11-1) 56x-36x=320 17x=320 x=320/17 30) x/3-20-x/7=10 21(x/3-20-x/7)=21(10) 7x-3(20-x)=210 7x-60+3x=210 10x=270 x=27 31) 2x-5/5+x+2/4=6 20(2x-5/5+x+2/4)=20(6) 4(2x-5)+5(x+2)=120 8x-20+5x+10=120 13x=130 x=13 32) 5x/3-2x+3/6=2/7-2x/3 42(5x/3-2x+3/6)=42(2/7-2x/3) 14(5x)-7(2x+3)=12-14(2x) 70x-14x-21=12-28x 84x=33 x=33/84 <-个答案好似唔系好岩
26. 2(4-2x)-15(2-x)=22 8-4x-30+15x =22 11x-22=22 11x=44 x=4 27. 5(0.4-3)+7(1.5x-7)+4=2.5x 2-15+10.5x-49+4=2.5x -58+10.5x=2.5x 8x=58 x=7.25 28. 8[2(6x-4)-(4+3x)]=120+18x 8[12x-8-4-3x]=120+18x 96x-64-32-24x=120+18x 72x-96= 120+18x 54x=216 x=4