(1)2(x+15)-21=3x-15 (2)3(x+8)=5x+8 (3)4(x+5*0.8)=7x+5*0.8 (4
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(1)2(x+15)-21=3x-15 (2)3(x+8)=5x+8 (3)4(x+5*0.8)=7x+5*0.8 (4)x=2*[1.25(x-10)-10] 方程,
(1)2(x+15)-21=3x-15
2x+30-21=3x-15
-x=-24
x=24
(2)3(x+8)=5x+8
3x+24=5x+8
2x=-16\x=8
(3)4(x+5*0.8)=7x+5*0.8
4x+16=7x+4
3x=-12
x=-4
(4)x=2*[1.25(x-10)-10]
x=2.5(x-10)-20
x=2.5x-45
-1.5x=-45
x=30
2x+30-21=3x-15
-x=-24
x=24
(2)3(x+8)=5x+8
3x+24=5x+8
2x=-16\x=8
(3)4(x+5*0.8)=7x+5*0.8
4x+16=7x+4
3x=-12
x=-4
(4)x=2*[1.25(x-10)-10]
x=2.5(x-10)-20
x=2.5x-45
-1.5x=-45
x=30
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