用遞等式進行計算,能簡便的要簡便簡便計算

2021-05-30 09:54:31 字數 1022 閱讀 1381

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

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