www.5129.net > 解方程:35%x=9%x 28+70%x=90%x 26%x=22% 求...

解方程:35%x=9%x 28+70%x=90%x 26%x=22% 求...

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(1)30%x=90 0.3x=90 0.3x÷0.3=90÷0.3 x=300(2)x+20%x=40 1.2x=40 1.2x÷1.2=40÷1.2 x=331 3 (3)40-4x=12 40-4x+4x=12+4x 12+4x=40 12+4x-12=40-12 4x=28 4x÷4=28÷4 x=7

(1)35%x=42 35%x÷35%=42÷35% x=120;(2)78%x-33%x=58.5 45%x=58.5 45%x÷45%=58.5÷45% x=130;(3)9x-36=288 9x-36+36=288+36 9x÷9=324÷9 x=36;(4)x-75%x=37.5 25%x=37.5 25%x÷25%=37.5÷25% x=150.

28%x=72x=72÷28%x=7分之180028%x+37%x=22.7555%x=22.75x=22.75÷55%x=11分之455x+40%x=8.4140%x=8.4x=8.4÷140%x=6

使方程两边相等的未知数的值叫做方程的解.由此可见,26才是方程35-X=9的解.而X=26依然是含有未知数的等式,仍然是一个方程.

(1)X+25%X=50, 1.25X=50, 1.25X÷1.25=50÷1.25, X=40;(2) 7 8 :X=20%, 0.2X= 7 8 ,0.2X÷0.2= 7 8 ÷0.2, X= 35 8 ;(3)30%X-2.6=6.4,0.3X-2.6+2.6=6.4+2.6,0.3X÷0.3=9÷0.3, X=30.

35-x=9,35-x+x=9+x9+x=359+x-9=35-9x=26或者直接利用减数=被减数-差得x=35-9=26

80%x=72 0.8x=72x=72÷0.8x=9028%x+37%x=22.75 0.28x+0.37x=22.750.65x=22.75x=22.75÷0.65x=35x+40%x=8.4x+0.4x=8.41.4x=8.4x=8.4÷1.4x=6

15+35%x=500.35x=35x=100 7.5X-x=26 6.5x=26x=5x+30%x=65 1.3x=65x=5045%x=5.85 0.45x=5.85x=13

30%x+40=80 解:30%x=80-40 x=40除以0.3 x=400/3 27+3分之2x=54 解:2/3x=54-27 x=27x3/2 x=40.5100-30-x=25%x 解:70-x=25%x x+25%x=70 1.25x=70 x=70除以1.25 x=5672-9分之5x=x乘30% 解:(5/9+30%)x=72 77/90x=72 x=72x90/77 x=6480/77 x+5分之x=240 解;(1+1/5)x=240 6/5x=240 x=240x5/6 x=200

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