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88.8x8.7 11.2x9.9.2x1.2巧算

88.8x8.7+11.2x9.9-11.2x1.2 =88.8x8.7+11.2x(9.9-1.2) =88.8x8.7+11.2x8.7 =(88.8+11.2)x8.7 =100x8.7 =870

88.8x8.7+11.2x(9.9-1.2) =88.8x8.7+11.2x8.7 =8.7x(88.8+11.2) =8.7x100 =870 请采纳,你的采纳是我上进的动力!可以追问,一直到懂!!

2(x-2)-3(4x-1)=9(1-x) 2x-4-12x+3=9-9xx=-102. 11x+64-2x=100-9x 18x=36x=23. 15-(8-5x)=7x+(4-3x) 15-8+5x=7x+4-3xx=-34. 3(x-7)-2[9-4(2-x)]=22 3x-21-2(9-8+4x)=223x-21-2-8x=22-5x=55x=-115. 2(x-2)+2=x+1 2x-4+2=x+1x=36. 30x-10(10-x)=1...

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