5x+2x=33.6,7x-4x=0.75,2x+7x+2.1=12,56x-32x-119=361,解方程

5x+2x=33.6,
7x=33.6;
x=4.8;
7x-4x=0.75,
3x=3/4;
x=1/4;
2x+7x+2.1=12,
9x=8.1;
x=0.9;
56x-32x-119=361
24x=480;
x=20;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,第二道我看不明白！除号用÷7x-4x=0.753x=0.75;x=0.75÷3;x=0.25;