2.5×4-x=4.2

x+x-2.5+x-4=85 3.2+x=4.6 x-2.08=5.76 1.2x=0.84 3x+0.5x=4.2 4x-2.16=1.2 x-0.2x=16 2x-4*2.5=3.6 x除以5.4=0.26 3x+0.5x=4.2 4x-2.16=1.2 x-0.2x=16 2x-4x[这个x是乘】2.5=3.6 3x+5x=168 怎么解 2.5×4-x=4.2 4X减3.7x=12 4.2x加2.5x=1.34 8X减3x=15.6 (x减3）除2=7.5 35X加13x=9.6 0.95*4+6x=5 4.2(x-2)=8.4 (x+3.2)*0.4=1.6 x-1.1+0.6=2.4 8.7(x-5.9)=09.2x-x=49.2 x+2.5x=0.7 x-0.76x=0.96 12x=300-4x 4.2x-2.5x=13.4 4.2X-2.5X=13.26方程 4.2x-7=2.5x+4.9 7x+2x=0.81 4(x-6)=36 2x+0.2xX2=36 3.4x-6=4.2 7.8x+5=44 7.5x+2.5=20 25.8-2x=12-7 4x+2.8=5.040.9x-4X1.3=1.1 1.3x7=25.1-8x 4.8+0.5x=6.3 (25+2x)X4=340大写的X是乘 小写的是x 求x是几 解方程：30+10(x-6)=30 6x-7=5x+4 4(4x-11)=3(22-2x) 7(2x-6)=84 5(x-8)=3x 4.2x-9=2.5x+2.9还有一题:9(2x-3)-2=5(2x-1)注意,要正确, 9^x+4^x=2.5*6^x 4-x=2(-0.5x²+2.5x-2) 2.5x-4x(2000-x)=1100 解方程：2x--9.1=4.7 2.7+4x=12.7 6(x+1.2)=24 4.2x+2.5x=134 4x-2.5=1.8.x=? 方程：10.5{x-4}=2.5x 3.5X+2.5(14-X)=4