8x( 10÷3.2 ) -2.5
8x( 10÷3.2 ) -2.5
8x( 10÷3.2 ) -2.5
=8x10÷3.2-2.5
=80÷3.2-2.5
=25-2.5
=22.5
22.5-8x:3.2+2.5x=100
(22.5-8x):(3.2+2.5x)=100
22.5-8x=100(3.2+2.5x)
22.5-8x=320+250x
258x=-297.5
x=-595/516
求解答:22.5-8x÷3.2+2.5x=100
本题无解
3.2x2.5+0.8x2.5
6x2+29x-5=0 (6x-1)(x+5)=0 x=1/6,-5 8x2+10x+3=0 (2x+1)(4x+3)=0 x=-1/2,-3/4 6x2=3x x(6x-3)=0 x=0,1/2 2x2-13=0 x^2=6.5 x=√6.5,-√6.5 3x=1-2x2 2x^2+3x-1=0 公式法:x=(-3+√17)/4,(-3-√17)/4 7x-3=x2 x^2-7x+3=0 公式法:x=(7+√37)/2,(7-√37)/2 x(2-3x)=x2 2x-3x^2=x^2 4x^2-2x=0 2x(2x-1)=0 x=0,1/2
22.5-8x:3.2+2.5x=100求x的解谢谢
22.5-8x:3.2+2.5x=100
22.5-8x÷3.2+2.5x=100
22.5-2.5x+2.5x=100
22.5=100
∵22.5≠100
∴方程无解。
3.2x2.5=0.8x(口x口)
3.2x2.5=0.8x(axb)
8=0.8x(axb)
10=axb
a=2,b=5;a=5,b=2;a=2.5,b=4;a=4,b=2.5;a=1,b=10;a=10,b=1
等......
(5.8x0.4—3.2x0.4)x2.5
(5.8x0.4—3.2x0.4)x2.5
=5.8x0.4x2.5-3.2x0.4x0.25
=5.8x(0.4x2.5)-3.2x(0.4x0.25)
=5.8×1-3.2×1
=5.8-3.2
=2.6
或者
(5.8x0.4—3.2x0.4)x2.5
=(5.8-3.2)x0.4x2.5
=2.6x1
=2.6
3.2×8+8x=49.6
3.2×8+8x=49.6
25.6+8x=49.6
8x=24
x=3
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8X -3.2 X ×5=40
8X -3.2 X ×5=40
解:8X-16X=40
-8X=40
X=40÷(-8)
X=-5