2.8+x=10.35 5.2x-x=6.3 1.2x-4.5×0.8=4.5 2.7(x-6.5)=6.21解这些方程

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2.8+x=10.355.2x-x=6.31.2x-4.5×0.8=4.52.7(x-6.5)=6.21解这些方程2.8+x=10.355.2x-x=6.31.2x-4.5×0.8=4.52.7(x-

2.8+x=10.35 5.2x-x=6.3 1.2x-4.5×0.8=4.5 2.7(x-6.5)=6.21解这些方程
2.8+x=10.35 5.2x-x=6.3 1.2x-4.5×0.8=4.5 2.7(x-6.5)=6.21解这些方程

2.8+x=10.35 5.2x-x=6.3 1.2x-4.5×0.8=4.5 2.7(x-6.5)=6.21解这些方程
(1)x=7.55
(2)x=1.5
(3)x=6.75
(4)x=8.8

(6)5.8*4.5+0.4x=29.1 0.4x=3 x=7.5 (7)5(x+4.4)=(9)15x+3.8*12=87.6 15x=42 x=2.8 (10)5.6x=17.28-4x 9.

2.8+x=10.35
x=10.35-2.8
x=7.55
5.2x-x=6.3
(5.2-1)x=6.3
4.2x=6.3
x=6.3÷4.2
x=3÷2
x=1.5
1.2x-4.5*0.8=4.5
1.2x=4.5+4.5*0.8
1.2x=8.1
x=8.1÷1.2
x=6.75
2.7(x-6.5)=6.21
x-6.5=6.21÷2.7
x-6.5=2.3
x=2.3+6.5
x=8.8