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4+0.7x=19+2x

4+0.7x=19+2x 2x-0.7x=4-19 1.3x=-15 x=-150/13

4.8x+7.2x=19.2 12x=19.2 x=19.2/12 x=1.6

(1)6x+2.34=2.7x+3 (6-2.7x)=3-2.34 0.3x=0.66 x=2.2 (2) 5.4+3x-4x=4.3 (4-3)x=5.4-4.3 x=1.1 (3) 6x-(4-x)=17 (6+1)x=17+4 7x=21 x=3 (4)15-2x=19-3x (3-2)x=19-15 x=4 (5) 7(4-x)=3(2+x) 28-7x=6+3x (7+3)x=28-6 x=2.2 (6) 5x+4(x+1)...

用十字相乘法分解因式: 2x²-19x+35=0 解:(2x-5)(x-7)=0 x1=2.5 或 x2=7

(1)70%x=14,70%x÷70%=14÷70%, x=20;(2)30%x+16=25, 30%x+16-16=25-16, 30%x=9, 30%x÷30%=9÷30%,x=30;(3)2x+20%x=44, 2.2x=44, 2.2x÷2.2=44÷2.2, x=20;(4)(1-0.375)x= 5 8 , 0.625x= 5 8 , 0.625x÷0.625= 5 8 ÷0.625, ...

设一千克李子Y元,则一千克桃子1.4Y元,有2Y+2×1.4Y=19.2,2Y+2.8Y=19.2 4.8Y=19.2 Y=4

解:2x=19-15 x=4÷2 x=2

(5x+19)=4^3=64; x=(64-19)/5=45/5=9 (2x+7)=y^2 2*9+7=y^2 y= +/- 5

19x34+22x57 =19x34+22x3x19 =19x(34+66) =19x100 =1900 谢谢,请采纳

2×3/4+4x=19.5 1.5+4x=19.5 4x=19.5-1.5 x=18÷4 x=4.5

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