五年级上册数学计算题大全300道 五年级4.5除以18的简便方法?
五年级4.5除以18的简便方法?
五年级4.5除以18的简便方法?
4.5/18
=45/180
=5*9/(9*5*4)
=1/4
=0.25
333乘46加999除以18的简便方法-(五年级)
(333×46+999)÷18
=(333×46+3×333)÷18
=333×(46+3)÷18
=(9×37)×49÷(9×2)
=37×49÷2
=37×(50-1)÷2
=37×50÷2-37×1÷2
=1850÷2-37÷2
=925-18.5
=906.5
39除以2.5 简便运算五年级
39除以2.5
=39×0.4÷(2.5×0.4)
=39×0.4
=15.6
16.8除以0.8五年级简便计算
16.8除以0.8=5x16.8÷4=5x4.2=21

五年级简便方法计算
12.5×9.3-7.7×12.5
= 12.5×(9.3-7.7)
= 12.5×1.6
=12.5×4*0.4
=50×0.4
=20
4.86×9.7+0.486×3
= 4.86×(9.7+0.3)
= 48.6
8.8÷3.2÷2.5的简便方法五年级
=6.8×25÷25+32÷25
=(6.8×5×5+32)÷25
=(34×5+32)÷25
=(170+32)÷25
=202÷25.
因为100÷25=4,所以202÷25=8.8
简便方法大全五年级
=(2.5*4)*(8*0.125)
=10*1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
3.6×0.5 6.4×0.05简便方法五年级
3.6×0.5 6.4×0.05简便方法五年级
3.6×0.5 6.4×0.05
=1.8+3.2
=5
直接计算
没有计算
用简便方法计算,五年级
1/2+1/(2*3)+1/(3*4)....+1/(n*(n+1))
1/(n*(n+1))=1/n-1/(n+1)
1/2+1/2-1/3+1/3-1/4....-1/8=1-1/8=7/8
98×102
=(100+2)×(100-2)
=100²-2²
=10000-4
=9996