0.8x+3.2=7.2
问题描述：
0.8x+3.2=7.2
12.5-3x=6.5
56.4÷x+14.8=24.2
1.2（x-0.64）=0.54
x+12.5=3.5x
7.3×2.1-0.9x=7.86
递等式计算（能简则简)
6.4×0.29+6.4×8.71+6.4
=
=
=
2.98×1.25×(4-0.8)×0.25
=
=
=
9.9×101-9.9
=
=
=
[0.68÷(3.2-3.03)+1.4]÷(6-0.6)
=
=
=
全部答出给一百!
明天答就不给分了!
答
1 0.8x=4 x=5
2 3x=6 x=2
3 56.4÷x=9.4 x=6
4 1.2x=0.54+0.768=1.308 x=1.09
5 2.5x=12.5 x=5
6 0.9x=7.47 x=8.3
7 6.4×0.29+6.4×8.71+6.4
=6.4×(0.29+8.71+1)
=6.4×10
=64
8 2.98×1.25×(4-0.8)×0.25
=2.98×1.25×(4×0.25)-2.98×1.25×(0.8×0.25)
=2.98×1.25-2.98×0.25
=2.98
9 9.9×101-9.9
=9.9×(101-1)
=9.9×100
=990
10 [0.68÷(3.2-3.03)+1.4]÷(6-0.6)
=(0.68÷0.17+1.4)÷5.4
=(4+1.4)÷5.4
=1