解方程.4.5×6+4x=41 7x-3.4x=0.72 2x+1.5x=42 &nb
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解方程. 4.5×6+4x=41 | 7x-3.4x=0.72 |
2x+1.5x=42 | (x-4.5)×6=31.8 |
x÷1.2=8 | (x+1.7)÷3=1.4. |
(1)4.5×6+4x=41,
27+4x=41,
27+4x-27=41-27,
4x=14,
4x÷4=14÷4,
x=3.5;
(2)7x-3.4x=0.72,
3.6x=0.72,
3.6x÷3.6=0.72÷3.6,
x=0.2;
(3)2x+1.5x=42,
3.5x=42,
3.5x÷3.5=42÷3.5,
x=12;
(4)(x-4.5)×6=31.8,
6x-27=31.8,
6x-27+27=31.8+27,
6x=58.8,
6x÷6=58.8÷6,
x=9.8;
(5)x÷1.2=8,
x÷1.2×1.2=8×1.2,
x=9.6,
(6)(x+1.7)÷3=1.4,
(x+1.7)÷3×3=1.4×3,
x+1.7=4.2,
x+1.7-1.7=4.2-1.7,
x=2.5.
27+4x=41,
27+4x-27=41-27,
4x=14,
4x÷4=14÷4,
x=3.5;
(2)7x-3.4x=0.72,
3.6x=0.72,
3.6x÷3.6=0.72÷3.6,
x=0.2;
(3)2x+1.5x=42,
3.5x=42,
3.5x÷3.5=42÷3.5,
x=12;
(4)(x-4.5)×6=31.8,
6x-27=31.8,
6x-27+27=31.8+27,
6x=58.8,
6x÷6=58.8÷6,
x=9.8;
(5)x÷1.2=8,
x÷1.2×1.2=8×1.2,
x=9.6,
(6)(x+1.7)÷3=1.4,
(x+1.7)÷3×3=1.4×3,
x+1.7=4.2,
x+1.7-1.7=4.2-1.7,
x=2.5.