数学。用简便方法计算,谢谢你!
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374+59+(26+141)
=(374+26)+(59+141)
=400+200
=600
44x25
=11x4x25
=11x100
=1100
199x40
=(200-1)x40
=200x40-1x40
=8000-40
=7960
68x31+69x68
=68x(31+69)
=68x100
=6800
9.29+5.2+0.71+4.8
=(9.29+0.71)+(5.2+4.8)
=10+10
=20
13.56-7.27-2.73
=13.56-(7.27+2.73)
=13.56-10
=3.56
=(374+26)+(59+141)
=400+200
=600
44x25
=11x4x25
=11x100
=1100
199x40
=(200-1)x40
=200x40-1x40
=8000-40
=7960
68x31+69x68
=68x(31+69)
=68x100
=6800
9.29+5.2+0.71+4.8
=(9.29+0.71)+(5.2+4.8)
=10+10
=20
13.56-7.27-2.73
=13.56-(7.27+2.73)
=13.56-10
=3.56
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