解方程①x÷1.8=10.5②
解方程①x÷1.8=10.5②6x-0.9=4.5③7.3x+5.6x=5.16....
解方程①x÷1.8=10.5②6x-0.9=4.5③7.3x+5.6x=5.16.
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①x÷1.8=10.5, x÷1.8×1.8=10.5×1.8, x=18.9;
②6x-0.9=4.5, 6x-0.9+0.9=4.5+0.9, 6x=5.4, 6x÷6=5.4÷6, x=0.9;
③7.3x+5.6x=5.16, (7.3+5.6)x=5.16, 12.9x=5.16, 12.9x÷12.9=5.16÷12.9, x=0.4. |
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