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简介:
1)2+1.8-5x=3.6
2+1.8-5x+5x=3.6+5x
3.8=3.6+5x
3.8-3.6=3.6+5x-3.5
0.2=5x
0.2÷5=5x÷5
x=0.04
(2)2x÷0.3=4.2
2x÷0.3×0.3=4.2×0.3
2x=1.26
2x÷2=1.26÷2
x=0.63
(3)6x+4x-11=2.9
10x-11=2.9
10x-11+11=2.9+11
10x=13.9
10x÷10=13.9÷10
x=1.39
(4)7(x-1.2)=2.1
7(x-1.2)÷7=2.1÷7
x-1.2=0.3
x-1.2+1.2=0.3+1.2
x=1.5
(5)0.5+3x=6.2
0.5+3x-0.5=6.2-0.5
3x=5.7
3x÷3=5.7÷3
x=1.9
(6)x-0.3x=0.49
0.7x=0.49
0.7x÷0.7=0.49÷0.7
x=0.7
(7)7.5+x=17
7.5+x-7.5=17-7.5
x=9.5
(1)2+1.8-5x=3.6
2+1.8-5x+5x=3.6+5x
3.8=3.6+5x
3.8-3.6=3.6+5x-3.5
0.2=5x
0.2÷5=5x÷5
x=0.04
(2)2x÷0.3=4.2
2x÷0.3×0.3=4.2×0.3
2x=1.26