x-20 30=90解方程
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 11:25:18
![x-20 30=90解方程](/uploads/image/f/889984-64-4.jpg?t=x-20+30%3D90%E8%A7%A3%E6%96%B9%E7%A8%8B)
90%x-80=70%x+700.9x-80=0.7x+700.9x-0.7x=80+700.2x=150x=150÷0.2x=750
(x+120)/90=(x-120)/7070(x+120)=90(x-120)70x+8400=90x-1080090x-70x=10800+840020x=19200x=960
去括号180-x+90-x=180移项180+90-180=x+x合并同类项90=2x即2x=90两边除以2x=90÷2x=45
5x+x=906x=90合并同类项x=15化未知数系数为1
80%x+90%x=680.8x+0.9x=681.7x=68x=68÷1.7x=40
90+1/3x=x90=x-1/3x90=2/3xx=90÷2/3x=135
X+80%x=90 (1+80%)x=90 x=90÷1.8 x=50
(x-120)/70=(x-120)/9070(x-120)=90(x-120)20(x-120)=0x-120=0x=120祝学习进步,望采纳~~
x+25%x=90(1+25%)x=901.25x=90x=90÷1.25x=72
x×x/9=90x²/9=90x²=810x=±√810x=±9√10(±9倍根号10)
90%X-215=80%X+1250.9x-215=0.8x+1250.9x-0.8x=125+2150.1x=340x=340÷0.1x=3400
180-x=270-3x+63x-x=276-180x=96/2x=48
120%X×90%=x+88108%x=x+88108%x-x=888%x=88x=1100
x=180/5=36
x/40%+40=90x/0.4=90-40x=50*0.4x=20
9x=90+4x9x-4x=905x=90x=18
3x-90=x+903x-x=90+902x=180x=180÷2x=90很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满意回答】按钮.
X-90-X=20-90=20题目有问题,检查一下,将正确的抄上来.再问:对再答:书上印刷错误,出版社校对不严格,误人子弟。
90+25=x+x115=2xx=115/2=57.5
x=602(x/45)+x/90-x/60=12x/90+x/90-x/60=13x/90-x/60=16x/180-3x/180=1x=60