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用简便方法计算(1)1.19+3.1+0.81+6.9(2)44×125×8(3)38×49+38(4)25×3+75×3(5)1600÷4÷4(6)25×138×4(7)(40+8)×125(8)(22+25)×4(9)36×24+19×24+45×24(10)129×27+129×72+129.
题目详情
用简便方法计算
(1)1.19+3.1+0.81+6.9 | (2)44×125×8 |
(3)38×49+38 | (4)25×3+75×3 |
(5)1600÷4÷4 | (6)25×138×4 |
(7)(40+8)×125 | (8)(22+25)×4 |
(9)36×24+19×24+45×24 | (10)129×27+129×72+129. |
▼优质解答
答案和解析
解;(1)1.19+3.1+0.81+6.9
=(1.19+0.81)+(3.1+6.9)
=2+10
=12
(2)44×125×8
=125×8×44
=1000×44
=44000
(3)38×49+38
=38×(49+1)
=38×50
=1900
(4)25×3+75×3
=3×(25+75)
=3×100
=300
(5)1600÷4÷4
=1600÷(4×4)
=1600÷16
=100
(6)25×138×4
=25×4×138
=100×138
=13800
(7)(40+8)×125
=48×125
=8×125×6
=1000×6
=6000
(8)(22+25)×4
=22×4+25×4
=88+100
=188
(9)36×24+19×24+45×24
=24×(36+19+45)
=24×100
=2400
(10)129×27+129×72+129
=129×(27+72+1)
=129×100
=12900
=(1.19+0.81)+(3.1+6.9)
=2+10
=12
(2)44×125×8
=125×8×44
=1000×44
=44000
(3)38×49+38
=38×(49+1)
=38×50
=1900
(4)25×3+75×3
=3×(25+75)
=3×100
=300
(5)1600÷4÷4
=1600÷(4×4)
=1600÷16
=100
(6)25×138×4
=25×4×138
=100×138
=13800
(7)(40+8)×125
=48×125
=8×125×6
=1000×6
=6000
(8)(22+25)×4
=22×4+25×4
=88+100
=188
(9)36×24+19×24+45×24
=24×(36+19+45)
=24×100
=2400
(10)129×27+129×72+129
=129×(27+72+1)
=129×100
=12900
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