9.57x2.8+6.3ⅹ0.28-0.28x2简便计算？
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设2.8为X, 等式变成9.57X+6.3*0.1X-0.1X*2.
=0.1X*95.7+6.3*0.1X-0.1X*2
=0.1X(95.7+6.3-2)
=0.1X* 100
=10X
=10*2.8
=28
=0.1X*95.7+6.3*0.1X-0.1X*2
=0.1X(95.7+6.3-2)
=0.1X* 100
=10X
=10*2.8
=28
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展开全部
=95.7*0.28+6.3*0.28-0.28*2
=0.28*(95.7+6.3-2)
=0.28*100
=28
=0.28*(95.7+6.3-2)
=0.28*100
=28
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