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102x85

102*85 = 8670 验算:8670÷102=85 或者:8670÷85=102

102×85 =100×85+2×85 =8500+170 =8670

102x0.85 =100x0.85+2x0.85 =85+1.7 =86.7

X=39

102X85 =100×85+2×85 =8500+170 =8670 99Xl76 =100×176-176 =17600-176 =17424 16XI25X25 =8×125×2×25 =1000×50 =50000 5600÷16÷5 =5600÷(16×5) =5600÷80 =70

.1642-237-63 =1642-(237+63) =1642-300 =1342 25*35*4*2 =(25*4)*(35*2) =200*70 =14000 102*85 =85*(100+2) =85*100+85*2 =8500+170 =8670

20000(1+2x)(1+x)=6000 所以20(2x2+3x+1)=6 所以2x2+3x+1=0.3 2x2+3x+0.7=0 所以20x2+30x+7=0 判别式=30 2-4×20×7=340 x1=(-30+2根号85)/40=-3/4+根号85/20 x2=(-30+2根号85)/40=-3/4-根号85/20 所以x=-3/4+根号85/20或-3/4-...

2(x+5)+2x=350 2x+10+2x=350 4x=340 x=85 祝学习进步,望采纳,不懂的欢迎追问...

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