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求未知数x的值.x%0.8x%6=16 2:5=x:10 ...

(1)5X-0.8×15=18, 5x-12+12=18+12, 5x=30,5x÷5=30÷5, x=6;(2)50%X+130%X=18, 180%x=18,180%x÷180%=18÷180%, x=10;(3)3.4X-120%X=11, 2.2x=11, 2.2x÷2.2=11÷2.2, x=5.

(1)4x+0.8x=9.6, 4.8x=9.6, 4.8x÷4.8=9.6÷4.8, x=2;(2)x: 5 6 =6:5, 5x= 5 6 ×6, 5x=5, 5x÷5=5÷5, x=1.

内项的积等于外项的积: 0.8X=2.4×12, X=2.4×12÷0.8, X=36。

23X-715=0.8×2323X-715+715=815+715 23X×32=1×32 X=32; X-13X=12 23X=1223X×32=12×32 X=18;12:13=x:25 13x=12×2513x×3=12×25×3 x=1425.

(1)16+5%x=24 16+0.05x=2416+0.05x-16=24-16 0.05x=80.05x÷0.05=8÷0.05x=160;(2)x-0.4x=0.72 0.6x=0.720.6x÷0.6=0.72÷0.6 x=1.2;(3)x: 2 7 =14: 2 5 2 5 x=14× 2 7 x=4÷ 2 5 x=10.

0.8X=2.37+5.63, 0.8X=8, X=8÷0.8, X=10。

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6x+5分之1=0.8×1.5 6x=1.2-1/5 6x=1 x=1/6

2x+17=35 3x-64=11 12+8x=52 0.8x-4.2=2.2 2x+5=10 3x-15=75 4x+4o=320 3x+77=122 5x-1.6=0.6 6x-4=20 10x-0.6=2.4 500-12x=140 1) 66x+17y=3967 25x+y=1200 答案:x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案:x=27 y=79 (3) 44x+90y=7796 44x...

X:0.8=7/10,X=7/10×4/5,X=14/25.

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