6x?一2x?=24 2.8x?+1.26x?一2x?=24 2.8x?+1.2x?=3.6 是多少

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6x?一2x?=24 2.8x?+1.26x?一2x?=24 2.8x?+1.2x?=3.6 是多少
6x?一2x?=24 2.8x?+1.2
6x?一2x?=24 2.8x?+1.2x?=3.6 是多少

6x?一2x?=24 2.8x?+1.26x?一2x?=24 2.8x?+1.2x?=3.6 是多少
第一个?:
6×?-2×?=24
4×?=24
=24÷4
=6
第二个:
2.8×?+1.2×?=3.6
4×?=3.6
=3.6÷4
=0.9