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2.4÷x十2.8=1.2

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÷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

原式 =1.2+1.4+1.6+1.8+2.0+2.2+2.4+2.6+2.8+3.0 =(1.2+3.0)x10÷2 =4.2x10÷2 =42÷2 =21 或者 =(1.2+2.8)+(1.4+2.6)+(1.6+2.4)+(1.8+2.2)+(2.0+3.0) =4+4+4+4+5 =4x4+5 =16+5 =21 供参考。

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

x÷0.5=1.2+2.8 x÷0.5=4 x=2

3.2×+2.8×-×=45 6×-×=45 5×=45 ×=45÷5 =9

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

2.4÷0.04=60, 125×32=4000, 0.25×0.4=0.1, 1 2 - 1 3 = 1 6 . 1.29-0.18=1.11, 13-7.2-2.8=3, 0.88+0.12=1, 0.4 2 =0.16, 5 8 - 3 5 = 1 40 , 1÷ 1 10 × 1 100 = 1 10 , 5 9 - 5 6 + 4 9 = 1 6 , 1 9 : 1 3 = 1 3 .

2.8十1.2x=5.2 1.2x=5.2-2.8 x=2.4÷1.2 x=2

(1)x=7.55 (2)x=1.5 (3)x=6.75 (4)x=8.8

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