脫式計算(能簡算的要簡算)(1)

2021-03-17 01:39:45 字數 2286 閱讀 6912

1樓:過去

(1)275+450÷18×24,

=275+25×24,

=275+(25×4)×6,

=275+600,

=875;

(2)1.46+29+371+8.54,

=(1.46+8.54)+(29+371),=10+400,

=410;

(3)1

4÷(3-5

19-14

19),=14

÷[3-(5

19+14

19)],=14

÷[3-1],=14

÷2,=18;

(4)19.9+19.9×99,

=19.9×(99+1),

=19.9×100,

=1990;

(5)3

10+(67?1

2)×725,

=310+67

×725?12

×725,=3

10+6

25?750,

=310

+(12

50?7

50),

=310

+110,=2

5;(6)888×9+28×111,

=111×8×9+28×111,

=111×72+28×111,

=111×(72+28),

=111×100,

=11100.

脫式計算.(能簡算的要簡算)①1÷0.25+0.25÷1-2.5×0.1②1+2+3+4+5+6+5+4+3+2+16666662③22×4+24×6+

2樓:度鍍

①1÷0.25+0.25÷1-2.5×0.1,=4+0.25-0.25,

=4+(0.25-0.25),

=4+0,

=4;②1+2+3+4+5+6+5+4+3+2+16666662

,=36

6666662

,=18×2

3333331×2

,=18

3333331;③2

2×4+2

4×6+2

6×8+2

8×10

+210×12,=1

2-14+1

4-16+1

6-18+1

8-110+1

10-112,

=12-112,=5

12;④1÷(1-0.99)-99÷(1-0.999),=1÷0.01-99÷0.001,

=100-99000,

=-98900.

脫式計算.(能簡算的要簡算)(1)12.75-517+114-1217(2)[1-(15+0.3)]

3樓:手機使用者

(1)12.75-5

17+11

4-1217,

=(12.75+11

4)-(5

17+12

17),

=14-1,

=13;

(2)[1-(1

5+0.3)]÷18,

=[1-0.5]÷18,

=0.5÷18,

=4;(3)2

9×40%+79÷5

2,=(29+79

)×40%,

=1×40%,

=0.4;

(4)1.25×3.2×2.5,

=(1.25×8)×(0.4×2.5),

=10×1,

=10.

脫式計算(能簡算的要簡算) ⑴1/4÷(2/3-3/2×1/3) ⑵24×(1/6+3/8+7/

4樓:昨夜星辰吉日

⑴1/4÷(2/3-3/2×1/3)

=1/4÷(2/3-1/2)=1/4÷(4/6-3/6)=1/4÷1/6=1/4x6=6/4=3/2;

⑵24×(1/6+3/8+7/12)=24x1/6+24x3/8+24x7/12=4+9+14=27;

⑶1/8×58+1/8×41+1/8=1/8x(58+41+1)=1/8x100=100/8=12.5.

5樓:

⑴1/4÷(2/3-3/2×1/3)=3/2

⑵24×(1/6+3/8+7/12)=27

⑶1/8×58+1/8×41+1/8=25/2

6樓:匿名使用者

(1)1/4÷(2/3一3/2×1/3)=1/4÷(4/6一3/6)=1/4×6/1=3/2

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