解方程①18-3x=54÷18 ②(x+5)÷2=10.8 ③45:x=3:10
解方程①18-3x=54÷18②(x+5)÷2=10.8③45:x=3:10④5x-12=3×8....
解方程①18-3x=54÷18 ②(x+5)÷2=10.8 ③45:x=3:10 ④5x-12=3×8.
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①18-3x=54÷18,
18-3x=3,
18-3x+3x=3+3x,
3+3x=18,
3+3x-3=18-3,
3x=15,
3x÷3=15÷3,
x=5;
②(x+5)÷2=10.8
(x+5)÷2×2=10.8×2,
x+5=21.6,
x+5-5=21.6-5,
x=16.6;
③
:x=3:10,
3x=
×10,
3x=8,
3x÷3=8÷3,
x=
;
④5x-12=3×8,
5x-12+12=3×8+12,
5x=36,
5x÷5=36÷5,
x=
.
18-3x=3,
18-3x+3x=3+3x,
3+3x=18,
3+3x-3=18-3,
3x=15,
3x÷3=15÷3,
x=5;
②(x+5)÷2=10.8
(x+5)÷2×2=10.8×2,
x+5=21.6,
x+5-5=21.6-5,
x=16.6;
③
4 |
5 |
3x=
4 |
5 |
3x=8,
3x÷3=8÷3,
x=
8 |
3 |
④5x-12=3×8,
5x-12+12=3×8+12,
5x=36,
5x÷5=36÷5,
x=
36 |
5 |
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