1.5+1.8x=10.2 x+1.6x=0.39 3.9(x-1.6)=15.6 23(x+14)=49 15x+12x=78 1.5x+x-12x=4 (1-29
1.5+1.8x=10.2x+1.6x=0.393.9(x-1.6)=15.623(x+14)=4915x+12x=781.5x+x-12x=4(1-29)x=350x+...
1.5+1.8x=10.2 x+1.6x=0.39 3.9(x-1.6)=15.6 23(x+14)=49 15x+12x=78 1.5x+x-12x=4 (1-29)x=350 x+25%x=40.
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(1)1.5+1.8x=10.2,
1.5+1.8x-1.5=10.2-1.5,
1.8x=8.7,
1.8x÷1.8=8.7÷1.8,
x=
;
(2)x+1.6x=0.39,
(1+1.6)x=0.39,
2.6x=0.39,
2.6x÷2.6=0.39÷2.6,
x=0.15;
(3)3.9(x-1.6)=15.6,
3.9x-3.9×1.6=15.6,
3.9x-6.24=15.6,
3.9x-6.24+6.24=15.6+6.24,
3.9x=21.84,
3.9x÷3.9=21.84÷3.9,
x=5.6;
(4)
(x+
)=
,
(x+
)÷
=
÷
,
x+
=
,
x+
-
=
-
,
x=
;
(5)
x+
x=
,
(
+
)x=
,
x=
,
x÷
=
1.5+1.8x-1.5=10.2-1.5,
1.8x=8.7,
1.8x÷1.8=8.7÷1.8,
x=
29 |
6 |
(2)x+1.6x=0.39,
(1+1.6)x=0.39,
2.6x=0.39,
2.6x÷2.6=0.39÷2.6,
x=0.15;
(3)3.9(x-1.6)=15.6,
3.9x-3.9×1.6=15.6,
3.9x-6.24=15.6,
3.9x-6.24+6.24=15.6+6.24,
3.9x=21.84,
3.9x÷3.9=21.84÷3.9,
x=5.6;
(4)
2 |
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1 |
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4 |
9 |
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1 |
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x+
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x+
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x=
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36 |
(5)
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