16.64除以x=3.215.2-6x=13.7x除以5+7=11.24.2x+x=6.76检验:7乘1.2+3x=9.3检验:8x-1.2x=4.76检验:

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16.64除以x=3.215.2-6x=13.7x除以5+7=11.24.2x+x=6.76检验:7乘1.2+3x=9.3检验:8x-1.2x=4.76检验:

16.64除以x=3.215.2-6x=13.7x除以5+7=11.24.2x+x=6.76检验:7乘1.2+3x=9.3检验:8x-1.2x=4.76检验:
16.64除以x=3.2
15.2-6x=13.7
x除以5+7=11.2
4.2x+x=6.76
检验:
7乘1.2+3x=9.3
检验:
8x-1.2x=4.76
检验:

16.64除以x=3.215.2-6x=13.7x除以5+7=11.24.2x+x=6.76检验:7乘1.2+3x=9.3检验:8x-1.2x=4.76检验:
16.64除以x=3.2
x=16.64÷3.2
.x=5.2
15.2-6x=13.7
-6x=13.7-15.2
.-6x=-1.5
.x=0.25
x除以5+7=11.2
x÷5=11.2-7
.x÷5=4.2
.x=21
4.2x+x=6.76.
x=1.3
检验:4.2×1.3+1.3=5.46+1.3=6.76
7乘1.2+3x=9.3
.x=0.3
检验:7×1.2+3×0.3=8.4+0.9=9.3
8x-1.2x=4.76
.x=0.7
检验:8×0.7-1.2×0.7=5.6-0.84=4.76