7.50减1.80等于几目录
7X-6.1X 1.8=2.4
解:7X-6.1X=2.4-1.8
0.9X=0.6
X=0.6÷0.9
X=2/3
81÷(1.8)2
=81÷(1.8x1.8)
=81÷[(9x0.2)x(9x0.2)]
=81÷[(9x9)x(0.2x0.2)]
=81÷(81x0.04)
=81÷81÷0.04
=1÷0.04
=25
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解答如下:
列式:0.75X-4*1.8=0.3
解:
0.75X-4*1.8=0.3
0.75X=0.3 4X1.8
0.75X=7.5
X=7.5÷0.75
X=10
即解为10