解方程8(2X-7)=5(X+13) 3(X+4.5)=60.
解方程8(2X-7)=5(X+13)3(X+4.5)=60....
解方程8(2X-7)=5(X+13) 3(X+4.5)=60.
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(1)8(2X-7)=5(X+13), 16x-56=5x+65, 16x-56-5x=5x+65-5x, 11x-56=65, 11x-56+56=65+56, 11x=121, 11x÷11=121÷11, x=11,
(2)3(x+4.5)=60, 3(x+4.5)÷3=60÷3, x+4.5=20, x+4.5-4.5=20-4.5, x=15.5. |
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