1樓:浮雲
①0.26×2.5+0.74×2.5+2.5,=(0.26+0.74+1)×2.5,
=2×2.5,
=5;②18.09-7.5×(0.14+1.06),=18.09-7.5×1.2,
=18.09-9,
=9.09;
③9÷[(38.02+1.98)×0.5],=9÷[40×0.5],
=9÷20,
=0.45.
脫式計算,能簡算的用簡算.5.5×17.3+6.7×5.5 ...
2樓:匿名使用者
(1)5.5×17.3+6.7×5.5
=5.5×(17.3+6.7)
=5.5×24
=132;
(2)1.5×105
=1.5×(100+5)
=1.5×100+1.5×5
=150+7.5
=157.5;
(3)9.07-22.78÷3.4
=9.07-6.7
=2.37;
(4)3.8+4.29+2.1+4.2
=(3.8+4.2)+(4.29+2.1)=8+6.39
=14.39;
(5)2.65×1.7+1.35×1.7
=(2.65+1.35)×
1.7=4×1.7
=6.8;
(6)23.4÷7.8-2.1
=3-2.1
=0.9;
(7)0.75×18÷0.15
=13.5÷0.15
=90;
(8)2.5×3.2×1.25
=2.5×(4×0.8)×1.25
=(2.5×4)×(0.8×1.25)
=10×1
=10;
(9)0.26×2.5+0.74×2.5+2.5=(0.26+0.74+1)×2.5
=2×2.5
=5;(10)18.09-7.5×(0.14+1.06)=18.09-7.5×1.2
=18.09-9
=9.09;
(11)9÷[(38.02+1.98)×0.5]=9÷[40×0.5]
=9÷20
=0.45;
(12)26×20.2-8.4-1.8
=525.2-8.4-1.8
=516.8-1.8
=515;
(13)90-78.09+4.23
=11.91+4.23
=16.14;
(14)32.34÷2.l×0.45
=15.4×0.45
=6.93;
(15)15.32-1.8×5-3.46
=15.32-9-3.46
=6.32-3.46
=2.86;
(16)(9-2.78)×15÷3.11
=6.22×15÷3.11
=93.3÷3.11
=30;
(17)(1.36+4.85)÷(0.15×6)=6.21÷0.9
=6.9;
(18)3.6÷[(1.3+0.6)×5]=3.6÷[1.9×5]
=3.6÷9.5
=3695
;(19)0.01+1.01×99
=0.01+(1+0.01)×99
=0.01+1×99+0.01×99
=0.01×(1+99)+99
=0.01×100+99
=1+99
=100;
(20)89.3×43+38×89.3+893×1.9=89.3×43+38×89.3+89.3×19=89.3×(43+38+19)
=89.3×100
=8930;
(21)10.01×101-10.01
=10.01×(101-1)
=10.01×100
=1001;
(22)38×7.3+27×3.8
=3.8×73+27×3.8
=3.8×(73+27)
=3.8×100
=380;
(23)32×1.25×0.25
=(4×8)×1.25×0.25
=(4×0.25)×(8×1.25)
=1×10
=10;
(24)38.75-(24.5+8.75)=38.75-24.5-8.75
=38.75-8.75-24.5
=30-24.5
=5.5.
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