1樓:小褲衩
(1)222×e68a8462616964757a686964616f31333337373663999+333×334,
=222×(333×3)+333×334,=666×333+333×334,
=(666+334)×333,
=1000×333,
=333000;
(2)45×99,
=45×(100-1),
=45×100-45×1,
=4500-45,
=4455;
(3)3(x+2)÷5=(x+2),
3(x+2)÷5×5=(x+2)×5,
3(x+2)=(x+2)×5,
3(x+2)-3(x+2)=(x+2)×5-3(x+2),2(x+2)=0,
2(x+2)÷2=0÷2,
x+2=0,
x+2-2=0-2,
x=-2;
(4)3(x+1)÷(2x-4)=6,
3(x+1)÷(2x-4)×(2x-4)=6×(2x-4),3(x+1)=6×(2x-4),
3x+3=12x-24,
3x+3-3x=12x-24-3x,
9x-24=3,
9x-24+24=3+24,
9x=27,
9x÷9=27÷9,
x=3;
(5)7×(x-2)=2x+3,
7x-14=2x+3,
7x-14-2x=2x+3-2x,
5x-14=3,
5x-14+14=3+14,
5x=17,
5x÷5=17÷5,
x=3.4;
(6)2x?1
2?2x+5
3=10x?17
4+1,
(2x?1
2?2x+5
3)×12=(10x?17
4+1)×12,
6(2x-1)-4(2x+5)=3(10x-17)+12,12x-6-8x-20=30x-51+12,4x-26=30x-39,
4x-26+39=30x-39+39,
4x+13=30x,
4x+13-4x=30x-4x,
26x=13,
26x÷26=13÷26,
x=0.5.
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