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解方程3.5x=5:4.2

3.5x+4.5x=4/5 解:(3.5+4.5)x=4/5 8x=4/5 x=4/5÷8 x=1/10

3.5x=5:4.2 3.5x=5/4.2 x=5/4.2*1/3.5 x=6

x:3.5=8:4.2 x=3.5×8÷4.2=6又3分之2

(3.5+5.5)x=7.2 9x=7.2 x=7.2÷9 x=0.8

解:3.5x一2x一10=8 1.5x=18 x=12

(1)5(x-3.5)=26.5, 5(x-3.5)÷5=26.5÷5, x-3.5=5.3, x-3.5+3.5=5.3+3.5, x=8.8;(2)4x-2.4×4=25.6, 4x-9.6=25.6, 4x-9.6+9.6=25.6+9.6, 4x=35.2, 4x÷4=35.2÷4, x=8.8;(3)(x-6)÷4=8, (x-6)÷4×4=8×4, x-6=32, x-6+6=32+...

x=5

①x+3.5=7,x+3.5-3.5=7-3.5, x=3.5;②4.8-x=2.1, 4.8-x+x=2.1+x, x+2.1=4.8,x+2.1-2.1=4.8-2.1, x=2.7;③2.7x-1.6=38.9,2.7x-1.6+1.6=38.9+1.6, 2.7x=40.5, 2.7x÷2.7=40.5÷2.7, x=15;④x÷4.5=20,x÷4.5×4.5=20×4.5, x=90.

5.5x+6.7=7.8 解:5.5x=1.1 x=0.2 3.5x-0.8x=11.34 解:2.7x=11.34 x=4.2 28-x+3.6=20 解:31.6-x=20 x=11.6 8x-27.54/2.7=1.8 解:8x-10.2=1.8 8x=12 x=1.5 9x-14*5.5=58 解:9x-77=58 9x=135 x=15

27.5-3.5=24;24÷4=6所以答案是6

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