解方程.6x÷5=9.6 1.7x+0.4x=3.15 5x-2×0.8=33.4 3(x-2.4)=8.4.
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解方程. 6x÷5=9.6 | 1.7x+0.4x=3.15 | 5x-2×0.8=33.4 | 3(x-2.4)=8.4. |
(1)6x÷5=9.6,
6x÷5×5=9.6×5,
6x÷6=48÷6,
x=8;
(2)1.7x+0.4x=3.15,
2.1x=3.15,
2.1x÷2.1=3.15÷2.1,
x=1.5;
(3)5x-2×0.8=33.4,
5x-1.6+1.6=33.4+1.6,
5x=35,
5x÷5=35÷5,
x=7;
(4)3(x-2.4)=8.4,
3(x-2.4)÷3=8.4÷3,
x-2.4=2.8,
x-2.4+2.4=2.8+2.4,
x=5.2.
6x÷5×5=9.6×5,
6x÷6=48÷6,
x=8;
(2)1.7x+0.4x=3.15,
2.1x=3.15,
2.1x÷2.1=3.15÷2.1,
x=1.5;
(3)5x-2×0.8=33.4,
5x-1.6+1.6=33.4+1.6,
5x=35,
5x÷5=35÷5,
x=7;
(4)3(x-2.4)=8.4,
3(x-2.4)÷3=8.4÷3,
x-2.4=2.8,
x-2.4+2.4=2.8+2.4,
x=5.2.
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