1, 解下列方程:
2(X-2.6)=8 5(X+1.5)=17.5
8(X-6.2)=41.6 (X-3)÷2=7.5
1, 解下列方程:
2(X-2.6)=8 5(X+1.5)=17.5
8(X-6.2)=41.6 (X-3)÷2=7.5
(X—2.6)=8 (X+1.5)=17.5 (X—6.2)=41.6 (X—3)÷2=7.5
X—2.6+2.6=8+2.6 X+1.5—1.5=17.5—1.5 x—6.2+6.2=41.6+6.2 (X—3)÷2X2=7.5X2
X=10.6 X=16 X=47.8 X—3=15
X—3+3=15+3
X=18
1)2(X-2.6)=8
2x-5.2=8.
2x=8+5.2
2x=13.2
x=6.6
2)5(X+1.5)=17.5
5x+7.5=17.5
5x=17.5-7.5
5x=10
x=2
3) 8(X-6.2)=41.6
8x-49.6=41.6
8x=41.6+49.6
8x=91.2
x=11.4
4)(X-3)÷2=7.5
x-3=7.5X2
x-3=15
x=15+3
x=18
就行了。
解:
1)2(X-2.6)=8
2x-5.2=8.
2x=8+5.2
2x=13.2
x=6.6
2)5(X+1.5)=17.5
5x+7.5=17.5
5x=17.5-7.5
5x=10
x=2
3) 8(X-6.2)=41.6
8x-49.6=41.6
8x=41.6+49.6
8x=91.2
x=11.4
4)(X-3)÷2=7.5
x-3=7.5X2
x-3=15
x=15+3
x=18