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2.4÷x+2.8=1.2怎么解

4x=28 x=28/4 x=7

[(X÷2-5)2-10]÷8=1 (X÷2-5)2-10=8 (X÷2-5)2=18 X÷2-5=9 X÷2=14 X=28

x-6.75=1.68 x=8.43 x÷2.8=5.6 x=15.68 1.2+1.2x=2.4 1.2x=1.2 x=1 4x-2.5=9.5 4x=12 x=3 0.7x+6×5=37 0.7x=7 x=10 1.2x-0.8x=4.8 0.4x=4.8 x=12

x÷0.5=1.2+2.8 x÷0.5=4 x=2

1.5x-2.8 +1.1=2.2 1.5x=2.2+2.8 -1.1 1.5x=3.9 x=2.6

解方程怎么做 x-2.8=8.6+1.2 x-2.8=9.8 x=9.8+2.8 x=12.6

2.8x÷1.2=8.4 解:2.8x=8.4×1.2 2.8x=10.08 x=10.08÷2.8 x=3.6

(1)40%x-2.8=7.6, 40%x-2.8+2.8=7.6+2.8, 40%x=10.4, x=10.4÷40%, x=26,(2)x+20%x=3.6, 1.2x=3.6, x=3.6÷1.2, x=3,(3)90%x-60%x=48 30%x=48, x=48÷30%, x=160.

(×+1.8)÷4=2.8 解:(×+1.8)÷4=2.8 ×+1.8=2.8×4 ×=11.2-1.8 ×=9.4 验算 把Ⅹ=9.4代入算式 (9.4+1.8)÷4 =11.2÷4 =2.8 左边等于右边

1.2x+2.8=5.2 1.2x=2.4 x=2 0.52×4x=0.6 4x=15/13 x= 15∕25 8x-13=83 8x=96 x=12 1.8x+3.6x=8.1 5.4x=8.1 x=1.5 4.5+4x=10.5 4x=6 x=1.5 50x÷2=72 50x=144 x=2.88

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