求未知数x(1)9×3-1.7x=8.3(2)x:
求未知数x(1)9×3-1.7x=8.3(2)x:125=0.75:12....
求未知数x(1)9×3-1.7x=8.3(2)x:125=0.75:12.
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驚嘆6225
2014-11-12
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(1)9×3-1.7x=8.3
27-1.7x=8.3,
8.3+1.7x=27,
8.3+1.7x-8.3=27-8.3,
1.7x÷1.7=18.7÷1.7,
x=11;
(2)x:1
=0.75:
0.5x=1.4×0.75
0.5x÷0.5=1.4×0.75÷0.5
x=2.1.
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