1樓:尼古丁
(1)7.29×4.6+46×1.271,=7.29×4.6+4.6×12.71,
=(7.29+12.71)×4.6,
=20×4.6,
=92;
(2)(28.7-18.6÷3.1)×0.8,=(28.7-6)×0.8,
=22.7×0.8,
=18.16;
(3)16-5.32-4.68,
=16-(5.32+4.68),
=16-10,
=6;(4)40.8+14.7÷(14.6-12.5),=40.8+14.7÷2.1,
=40.8+7,
=47.8;
(5)3.7×0.125+6.3÷8,
=3.7×0.125+6.3×1 8
,=(3.7+6.3)×0.125,
=1.25;
(6)0.72+9.6÷3.2,
=0.72+3,
=3.72.
用遞等式計算,寫出必要的計算過程,能簡便運算的要用簡便方法計算.100-870÷29-8815÷7.5+4.6-6.63.5×
2樓:桃兒
①100-870÷
29-88
=100-30-88
=-18
②15÷7.5+4.6-6.6
=2+4.6-6.6
=6.6-6.6
=0③3.5×
64×12.5
=(3.5×8)×內(8×12.5)
=28×100
=2800
④容51×7.5-49×7.5-1
=(51-49)×7.5-1
=2×7.5-1
=15-1
=14⑤4×(4.8+3.2÷4-5.6)=4×(4.8+0.8-5.6)
=4×0
=0⑥[8+(5-2)÷1.2]×5
=[8+3÷1.2]×5
=10.5×5
=52.5
用遞等式計算,能簡便的簡便計算
zhi1 7.28 dao1.28 0.25 版 7.28 1.28 0.25,6 0.25,5.75 2 0.64 權6.4 o.64 5.4,0.64 6.4 5.4 0.64 1,0.64 3 26.18 48.6 18 3.5,26.18 2.7 3.5,26.18 9.45,16.73 4...
遞等式計算(能簡便的用簡便方法計算)
1 66 32 16 11 66 11 32 16 6 2 12 2 8400 21 74 26 21 8400 21 74 26 8400 21 100 8400 2100 4 3 101 999 100 1 999 100 999 1 999 99900 999 100899 4 754 52 ...
遞等式計算,能簡便計算的一定要簡便計算
1 25 45.1 25 45 5.1 25 45 25 5.1,155 2.5,152.5 2 12.5 手.2 12.5 5.8 4,15 4,45 手 155.t8 t tt 1.t8 t tt t 1.t8 t,11 5.22,11.22 4 5.25 5.25 5.25 4 手 5.25 ...