解方程:1.9x+1.3x=8 &nb
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解方程:
1.9x+1.3x=8
(4.7-x)×1.3=5.98
2.5×2.4-2x=4.8
2.5x+3.4=18.4.
1.9x+1.3x=8
(4.7-x)×1.3=5.98
2.5×2.4-2x=4.8
2.5x+3.4=18.4.
(1)1.9x+1.3x=8,
3.2x÷3.2=8÷3.2,
x=2.5;
(2)(4.7-x)×1.3=5.98,
(4.7-x)×1.3÷1.3=5.98÷1.3,
4.7-x+x=4.6+x,
4.6+x-4.6=4.7-4.6,
x=0.1;
(3)2.5×2.4-2x=4.8,
6-2x+2x=4.8+2x,
4.8+2x-4.8=6-4.8,
2x÷2=1.2÷2,
x=0.6;
(4)2.5x+3.4=18.4,
2.5x+3.4-3.4=18.4-3.4,
2.5x÷2.5=15÷2.5,
x=6.
3.2x÷3.2=8÷3.2,
x=2.5;
(2)(4.7-x)×1.3=5.98,
(4.7-x)×1.3÷1.3=5.98÷1.3,
4.7-x+x=4.6+x,
4.6+x-4.6=4.7-4.6,
x=0.1;
(3)2.5×2.4-2x=4.8,
6-2x+2x=4.8+2x,
4.8+2x-4.8=6-4.8,
2x÷2=1.2÷2,
x=0.6;
(4)2.5x+3.4=18.4,
2.5x+3.4-3.4=18.4-3.4,
2.5x÷2.5=15÷2.5,
x=6.