0.9×{(15+2.85)÷85}简便计算?
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0.9×{(15+2.85)÷85}
=0.9×{(15+2+0.85)÷85}
=0.9×{(17+0.85)÷85}
=0.9×{17÷85+0.85÷85}
=0.9×{0.2+0.01}
=0.9×0.2+0.9×0.01
=0.18+0.009
=0.189
=0.9×{(15+2+0.85)÷85}
=0.9×{(17+0.85)÷85}
=0.9×{17÷85+0.85÷85}
=0.9×{0.2+0.01}
=0.9×0.2+0.9×0.01
=0.18+0.009
=0.189
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