遞等式計算能簡便的簡便,遞等式計算能簡便的簡便

2021-03-04 01:38:36 字數 2499 閱讀 9096

1樓:手機使用者

①125×3.2×2.5,

=125×8×0.4×2.5,

=(125×8)×(0.4×2.5),

=1000×1,

=1000;

②3.6×10.1,

=3.6×(10+0.1),

=3.6×10+3.6×0.1,

=36+0.36,

=36.36;

③5.8×2.7+0.58×73,

=5.8×2.7+5.8×7.3,

=5.8×(2.7+7.3),

=5.8×10,

=58;

④3.6+6.4×1.8,

=3.6+11.52,

=15.12;

⑤(1.48+3.02)÷(3.6×0.5),=4.5÷1.8,

=2.5;

⑥(36.7-4.9)×101-31.8,=31.8×101-31.8,

=31.8×(101-1),

=31.8×100,

=3180.

遞等式計算(能簡便的要簡便運算)(1)25×0.32×2.5(2)1.25×6.78+25×3.47+125×0.0382(3)(2.44-

2樓:阿斯頓

(1)25×

制0.32×2.5

=25×0.04×4×2×2.5

=(25×0.04)×(4×2.5)×2

=1×10×2

=10×2

=20;

(2)1.25×6.78+25×3.

47+125×0.0382=1.25×6.

78+125×0.0382+25×3.47=125×0.

0678+125×0.0382+25×3.47=125×(0.

0678+0.0382)+25×3.47=125×0.

106+25×3.47

=25×0.53+25×3.47

=25×(0.53+3.47)

=25×4

=100;

(3)(2.44-1.8)÷0.4×20

=0.64÷0.4×20

=1.6×20

=32;

(4)5+10+15+20+25+30+…+95=5+95+10+90+15+85+20+80+25+75+30+70+35+65+40+60+45+55+50

=(5+95)+(10+90)+(15+85)+(20+80)+(25+75)+(30+70)+(35+65)+(40+60)+(45+55)+50

=100+100+100+100+100+100+100+100+100+50

=100×9+50

=900+50

=950.

脫式計算能用簡便計算的要簡算.(1)310+4.25+3.7+134(2)0.125×3.2×25(3)17×44+54×17(4)7.8÷

3樓:手機使用者

(1)3

10+4.25+3.7+134=3

10+3.7+4.25+13

4=(3

10+3.7)+(4.25+134)

=4+6

=10;

(2)0.125×3.2×25

=0.125×8×0.4×25

=(0.125×8)×版(權0.4×25)=1×10

=10;

(3)1

7×44+54×17=1

7×(44+54)=17

×98=14;

(4)7.8÷〔32×(1-5

8)+3.6〕

=7.8÷〔32×3

8+3.6〕

=7.8÷〔12+3.6〕

=7.8÷15.6

=0.5;

(5)5

6÷〔3

4×(79-1

3)〕=56

÷〔34×49

〕=56÷1

3=2.5.

遞等式計算,能簡便計算的一定要簡便計算.25×40.1 12.5×3.2 100.d8÷d (0.25+0.25+0.2

4樓:鄭雨328丶

(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×(5.25×4),

=手×1,

=手;(5)5.84÷2.5÷5.4

=5.84÷(2.5×5.4),

=5.84÷1,

=5.84.

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