用简便方法计算 11分之7除以9+9分之1乘11分之4 4乘(8分之1加4分之3)减2分之1
1个回答
2013-07-06
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7/11÷9+1/9×4/11
=7/11×1/9+1/9×4/11
=1/9×﹙7/11+4/11﹚
=1/9×1
=1/9,等于9分之1
4×﹙1/8+3/4﹚-1/2
=4×1/8+4×3/4-1/2
=1/2+3-1/2
=3
=7/11×1/9+1/9×4/11
=1/9×﹙7/11+4/11﹚
=1/9×1
=1/9,等于9分之1
4×﹙1/8+3/4﹚-1/2
=4×1/8+4×3/4-1/2
=1/2+3-1/2
=3
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