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20×2.4+(X-20)X3.2-2.5x=5

20×2.4+(X-20)X3.2-2.5x=5 48+3.2X-64-2.5X=5 3.2X-2.5X=5-48+64 0.7X=21 X=30 解得X=30

(1)6:15=x:20 15x=6×20 15x÷15=120÷15 x=8(2)34:x=3:8 3x=34×8 3x÷3=6÷3 x=2(3)58:910=59:x 58x=910×59 58x×85=12×85 x=45(4)0.5x=0.756 0.75x=0.5×60.75x÷0.75=3÷0.75 x=4(5)x:15=1:2.4 2.4x=1×152.4x÷2.4=15÷2.4 x=6.25...

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5x+18=43 5x=43-18=25 x=25/5=5 18-3x=15 3x=18-15= 3 x=3/3=1 x-20%X=5 也就是 x-0.2x=5 0.8x=5 x=5/0.8=40 (3x/4)+(x/6)=22 转化为(9x/12)+(2x/12)=22 (11x/12)=22 11x=22*12 x=22*12/11=2*12=24 X乘(1—75%)=3.2 x(1-0.75)=3.2 0.25x=3.2 x=3...

.(X-1)(X-2)(X+3)(X+2)-60 =(x²+x-2)(x²+x-6)-60 =(x²+x)²-8(x²+x)+12-60 =(x²+x)²-8(x²+x)-48 =(x²+x+4)(x²+x-12) =(x²+x+4)(x+4)(x-3) 2.4(X+Y)^2+5-20(X+Y-1) =(x+y)²-20(x+y)...

0.5*(4.5+x)=20 4.5+x=40 x=40-4.5 x=35.5 6x-2.4*5=80 6x-12=80 6x=92 x=46/3 2分之1X-0.25X=10 0.25x=10 x=10÷0.25 x=40 x-5分之4-4=21 x-4.8=21 x=25.8

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4X-24=2X+20 解:2X=44 X=22 2X(X-0.7)=4.8 解:2X²-1.4X-4.8=0 X²-0.7X-2.4 =0 解:∵a=1.b=-0.7 c=-2.4, Δ=(-0.7)²-4×1×(-2.4)=14.5>0 X1=(0.7+√14.5)/2×1=(0.7+√14.5)/2, X2=(0.7-√14.5)/2×1=(0.7-√14.5)/2...

2.4×(5-3/8)+2又2/5×3/8 =2.4×(5-3/8)+2.4×3/8 =2.4×5-2.4×3/8+2.4×3/8 =12

解:2.4+X=2.3/0.5 X=4.6-2.4 X=2.2 0.68/20%*3/4*16-3.2/16

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