0.77×10.2×12点五的简便计算?
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把12.5变成100/8,就简便了。
0.77×10.2×12点五
=0.77×10.2×100/8
=7.7*102/8
=7.7*51/4
=(8-0.3)/4*51
=2*51-0.3*51/4
=98.175
0.77×10.2×12点五
=0.77×10.2×100/8
=7.7*102/8
=7.7*51/4
=(8-0.3)/4*51
=2*51-0.3*51/4
=98.175
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=0.77×10.2×12.5=0.77×【(10+0.2)×12.5】=0.77×(125+2.5)=0.77×(100+27.5)=77+0.77×27.5=77+0.77×(30-2.5)=77+23.1-0.77×(2+0.5)=100.1-1.54-0.385=99.56-0.385=99.175
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0.77×10.2×12.5
=0.77×5.1×(2×12.5)
=0.77×5.1×25
=0.77×5.1×(25×4)÷4
=0.77×100×(5.1÷4)
=77×1.275
=70×1.275+7×1.275
=89.25+8.925
=98.175
=0.77×5.1×(2×12.5)
=0.77×5.1×25
=0.77×5.1×(25×4)÷4
=0.77×100×(5.1÷4)
=77×1.275
=70×1.275+7×1.275
=89.25+8.925
=98.175
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