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7(6.5+x)=87.5

去括号 7×6.5+7x=87.5 45.5+7x=87.5 7x=42 x=6

7×6.5+x=87.5 45.5+x=87.5 x=87.5-45.5 x=43

7(6.5+x)=87.5 6.5+x=87.5÷7 6.5+x=12.5 x=12.5-6.5 x=6 不懂可追问,有帮助请采纳,谢谢!

6.7(6.5+x)=87 43.55+6.7x=87 6.7x=87-43.55 x=43.45÷6.7 x≈6.485

4*7(6.5+x)=87.5 x=-3.375

解:5 ( )-()6=87 解:设括号内的数字为x,这个数是5()的个位数,0

4(X一5·6)二87·5 4x-22.4=87.5 4x=109.9 x=27.475

0.1(x+6)=3.3×0.4 4(x-5.6)=1.6 7(6.5+x)=87.5 (27.5-3.5)÷x=4 x+19.8=25.8 5.6x=33.6 9.8-x=3.8 75.6÷x=12.6 5x+12.5...

36.7x87.5-86.5 x37.6 =36.7x87.5-86.5 x36.7-86.5x0.9 =36.7x(87.5-86.5)-86.5x1+86.5x0.1 =36.7-86.5+8.65 =45.35-86.5 =-41.15

9x+2y=87 5.2x+y=7 2x+5y=19 6.x+2y=21 3x+5y=56 7.5x+7y=52 5x+2y=22 8.5x+5y=65 7x+7y=203 9.8x+4y=56 x+4y=21 ...

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