简便运算题8道
1个回答
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0.9+9.9+99.9+999.9+9999.9
=10.8+99.9+999.9+9999.9
=1110.6+9999.9
=11110.5
8.8×1.25
=(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
11
0.125×32×25
=0.125×(4×8)×25
=(0.125×8)×(4×25)
=1×100
=100
9999×2222+3333×3334
=3333×6666+3333×3334
=3333×(6666+3334)
=33330000
20072007×2008-20082008×2007
=2007×10001×2008-2008×10001×2007
=0
123.123×234-234.234×123
=123×1.001×234-234×1.001×123
=0
3.89×4.4+0.611×44
=3.89×4.4+6.11×4.4
=(3.89+6.11)×4.4
=10×4.4
=44
0.111×3.7+0.777×0.9
=0.111×3.7+0.111×6.3
=0.111×(3.7+6.3)
=0.111×10
=1.11
=10.8+99.9+999.9+9999.9
=1110.6+9999.9
=11110.5
8.8×1.25
=(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
11
0.125×32×25
=0.125×(4×8)×25
=(0.125×8)×(4×25)
=1×100
=100
9999×2222+3333×3334
=3333×6666+3333×3334
=3333×(6666+3334)
=33330000
20072007×2008-20082008×2007
=2007×10001×2008-2008×10001×2007
=0
123.123×234-234.234×123
=123×1.001×234-234×1.001×123
=0
3.89×4.4+0.611×44
=3.89×4.4+6.11×4.4
=(3.89+6.11)×4.4
=10×4.4
=44
0.111×3.7+0.777×0.9
=0.111×3.7+0.111×6.3
=0.111×(3.7+6.3)
=0.111×10
=1.11
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