40道解方程练习题及答案

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/27 18:29:51
40道解方程练习题及答案

40道解方程练习题及答案
40道解方程练习题及答案

40道解方程练习题及答案
(1)12(2-3X)=4X+4 24-36X=4X+4 -40X=-20 X=1/2 (2)6-3(X+2/3)=2/3 6-3X-2=2/3 -3X=-10/3 X=10/9 (3)2(200-15X)=70+25X 400-30X=70+25X -55X=-330 X=6 (4)3(2X+1)=12 6X+3=12 6X=9 X=3/2 (5)1/4X-1/2=3/4 (1/4)X=5/4 X=5 (6)7X-5/4 =3/8 7X=13/8 X=13/56 (7)2X-1/6 = 5X+1/8 -3X=7/24 X=-7/72 (8)(1/2)X-7 = 9X-2/6 -(17/2)X=20/3 X=-20/51 (9)(1/5)X-1/2(3-2X)=1 (1/5)X-3/2+X=1 (6/5)X=5/2 X=25/12 (10)2X+(1/3)-5X-(1/6)=1 -3X+(1/6)=1 -3X=5/6 X=-5/18 (11)1/7(2X+14)=4-2X (2/7)X+2=4-2X (16/7)X=2 X=7/8 (12)3/10(200+X)-2/10(300-X)=300*9/25 60+(3/10)X-60+(1/5)X=108 (1/2)X=108 X=216 x÷(18+2)+1.5=x÷(18-2) x/20+1.5=x/16 4x+120=5x x=120 2(X+3)=3(X-3) 2X+6=3X-9 X=15 3X+30=0.4X 0.3X-0.4X=-30 -0.1X=-30 X=300;15X+45X=180 60X=180 X=3 3X-1·(50-X)=142 3X+X=142+5 4X=192 X=48 X+(X+2)=10 2X=8 X=4题:10 x + 90 = 290 10 x = 290-90x= 200/10x= 20题:10 x + 90 = 300 10 x = 300-90x= 210/10x= 21题:10 x + 90 = 310 10 x = 310-90x= 220/10x= 22题:10 x + 91 = 321 10 x = 321-91x= 230/10x= 23题:11 x + 93 = 324 11 x = 324-93x= 231/11x= 21题:12 x + 99 = 375 12 x = 375-99x= 276/12x= 23题:13 x + 91 = 455 13 x = 455-91x= 364/13x= 28题:18 x + 93 = 471 18 x = 471-93x= 378/18x= 2120%+(1-20%)(320-x)=320×40% 0.2+0.8*(320-x)=128 0.8*(320-x)=127.8 320-x=159.75 x=160.25 2(x-2)+2=x+1 2x-4+2=x+1 2x-2=x+1 x=3 2(x-2)-(3x-2)=-4 2x-4-3x+2=-4 -x-2=-4 -x=-2 x=215-(8-5x)=7x+(4-3x) 15-8+5x=7x+4-3x 7+5x=4x+4 x=-3 2x-3=x+1 x=4 4x-5x=6 x=-6 x/30+30=x/18 x=13503(x-2)+1=x-(2x-1) 3x-6+1=x-2x+1 3x-x+2x=1+6-1 4x=6 x=3/25(3-2x)-12(5-2x)=-17 15-10x-60-24x=-17 34x=-28 x=-14/173x-7(x-1)=3-2(x+3) 3x-7x+7=3-2x-6 3x-7x=2x=3-6-7 -2x=-10 x=5 2(x+8)=3(x-1) 2x+16=3x-3 2x-3x=-3-16 -x=-19 x=19 4/5X+X=(X+20)X6/5 X=40 6x+3+5=8x 2x=8 x=4 6x+8=7x-1 x=90.055x+0.045(20-x)=0.950.01x+0.9=0.95 x=5 5*18/60+5x=14x4.5+5x=14x9x=4.5x=0.540道题时间原因没完整标题号,不要忘记写解,