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4x+1.2×7=17.8怎么解方程?

4x+1.2×7=17.8 解:4x+8.4=17.8 4x=17.8-8.4 4x=9.4 x=2.35

4x+1.2×5=24.4的解:x=4.6。 解答过程如下: 4x+1.2×5=24.4 4x+6=24.4(把1.2×5计算出来) 4x=24.4-6(移项,把常数项都移到等式的一边,未知数移到等式的另一边) 4x=18.4(合并同类项) x=18.4÷4(等式两边同时除以4) x=4.6 扩展资料: ...

4x+1.2x5=28.8 解:4x+6=28.8 4x=28.8-6 4x=22.8 x=5.7

4x=8.5-2.1 4x=7.4 x=1.85

1/4X+(98-X)x2/7=26 7x+784-8x=728 x=56

用消元法。 x1+2x2+3x3=6 ① 4x1+5x2+6x3=15 ② 7x1+8x2+9x3=24③ ②-①*2,得2x1+x2=3,④ ③-①*3,得4x1+2x1=6.⑤ ④⑤同解,x2=3-2x1,代入①, x1+6-4x1+3x3=6, x3=x1.x1可以是任意数。

(2x+1)²-4x-2=0 4x²+4x+1-4x-2=0 4x²-1=0 x²=4分之1 x=±2分之1

解: 增广矩阵= 2 -3 0 2 8 1 5 2 1 2 3 -1 1 -1 7 4 1 2 2 12 r4-r2,r2-2r3 2 -3 0 2 8 -5 7 0 3 -12 3 -1 1 -1 7 3 -4 0 1 10 r1-2r4,r2-3r4,r3+r4 -4 5 0 0 -12 -14 19 0 0 -42 6 -5 1 0 17 3 -4 0 1 10 r2-4r1 -4 5 0 0 -12 2 -1 0 0 6 6 -5 ...

为y = 2×7(1) 1411米2 Z = 2(2) 4z的3倍= 4(3) (2)* 2 +(3) 3倍+6 Y = 8 (1)代入消除15X-42 = 8 y为 解决方案为x = 10/3 (1 )= 2 * 10/3-7 = -1 / 3 (2)和z = 1/2 *(1612-2)= -3 / 2 4 + 9 Y = 12(1) 1612-2Z = 1(2) 7倍+...

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