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x+75%x=49

x+75%x=49 解:1.75x=49 x=49÷1.75 x=28

25X49加75乘49简便运算 =(25+75)x49 =100x49 =4900

x(8-x)=9.75 8x-x²-9.75=0 x²-8x+9.75=0 (x-6.5)(x-1.5)=0 x=6.5或x=1.5

(1)x÷49=36, x÷49×49=36×49, x=16;(2)23x+15x=26, 1315x=26, 1315x÷1315=26÷1315, x=30;(3)16-75%x=23x,16-75%x+75%x=23x+75%x, 16÷1712=1712x÷1712, x=217;(4)3x+4.5×6=90, 3x+27-27=90-27, 3x÷3=63÷3, x=21.

解:75×(□+4) =75×□+75×4 =75×□+300 (75×□+300)-(75×□+4) =75×□+300-75×□-4 =75×□-75×□+300-4 =300-4 =296 答:他得到的结果与正确的结果相差296.

这样

25x49+75x17 =25x49+25x3x17 =25x49+25x51 =25x(49+51) =25x100 =2500

x÷75+x÷60=36 (1/75+1/60)x=36 3/100x=36 x=1200

75-55=2x 20=2x x=10

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