maths(right,very esay①(1-y)/2=2-[(2y-1)/3]②21%x-5%=5%x+0.11③(2y-1)/3-(10y+1)/6=(2y+1)/4-1④1/3[3y-(10-7y)/2)]-1/2[2y-9(2y+2)/3)]=y/2-1⑤(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=(y-5)/2
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![maths(right,very esay①(1-y)/2=2-[(2y-1)/3]②21%x-5%=5%x+0.11③(2y-1)/3-(10y+1)/6=(2y+1)/4-1④1/3[3y-(10-7y)/2)]-1/2[2y-9(2y+2)/3)]=y/2-1⑤(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=(y-5)/2](/uploads/image/z/12793325-5-5.jpg?t=maths%28right%2Cvery+esay%E2%91%A0%EF%BC%881-y%29%2F2%3D2-%5B%282y-1%29%2F3%5D%E2%91%A121%25x-5%25%3D5%25x%2B0.11%E2%91%A2%282y-1%29%2F3-%2810y%2B1%29%2F6%3D%282y%2B1%29%2F4-1%E2%91%A31%2F3%5B3y-%2810-7y%29%2F2%29%5D-1%2F2%5B2y-9%282y%2B2%29%2F3%EF%BC%89%5D%3Dy%2F2-1%E2%91%A4%280.4y%2B0.9%29%2F0.5-%280.03%2B0.02y%29%2F0.03%3D%EF%BC%88y-5%EF%BC%89%2F2)
maths(right,very esay①(1-y)/2=2-[(2y-1)/3]②21%x-5%=5%x+0.11③(2y-1)/3-(10y+1)/6=(2y+1)/4-1④1/3[3y-(10-7y)/2)]-1/2[2y-9(2y+2)/3)]=y/2-1⑤(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=(y-5)/2
maths(right,very esay
①(1-y)/2=2-[(2y-1)/3]
②21%x-5%=5%x+0.11
③(2y-1)/3-(10y+1)/6=(2y+1)/4-1
④1/3[3y-(10-7y)/2)]-1/2[2y-9(2y+2)/3)]=y/2-1
⑤(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=(y-5)/2
maths(right,very esay①(1-y)/2=2-[(2y-1)/3]②21%x-5%=5%x+0.11③(2y-1)/3-(10y+1)/6=(2y+1)/4-1④1/3[3y-(10-7y)/2)]-1/2[2y-9(2y+2)/3)]=y/2-1⑤(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=(y-5)/2
①(1-y)/2=2-[(2y-1)/3]
两边乘6
3-3y=12-4y+2
4y-3y=12+2-3
y=11
②21%x-5%=5%x+0.11
0.21x-0.05=0.05x+0.11
0.21x-0.05=0.11+0.05
0.16x=0.16
x=1
③(2y-1)/3-(10y+1)/6=(2y+1)/4-1
两边乘12
4y-2-20y-2=6y+3-12
6y+20y-4y=-2-2-3+12
22y=5
y=5/22
④1/3[3y-(10-7y)/2)]-1/2[2y-9(2y+2)/3)]=y/2-1
两边乘6
6y-10+7y-6y+18y+18=3y-6
25y+8=3y-6
22y=-14
y=-7/11
⑤(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=(y-5)/2
两边乘3
2.4y+5.4-3-2y=1.5y-7.5
1.1y=9.9
y=9