脫式計算,能簡算要簡算

2021-03-19 18:24:05 字數 1132 閱讀 6328

1樓:之蘿蘿蔔

(1)33.5-5.3-4.7+16.5,=(33.5+16.5)-(5.3+4.7),=50-10,

=40;

(2)9900÷25÷4,

=9900÷(25×4),

=9900÷100,

=99;

(3)1÷(3 5

+310

),=1÷9

10,=10 9

;(4)24×(2 3

+1 6

-3 8

),=24×2 3

+24×1 6

-24×3 8

,=16+4-9,

=20-9,

=11;

(5)1+0.45÷0.9-7 8

,=1+0.5-7 8

,=1.5-7 8

,=0.625;

(6)20

17-(3

17+2 3

),=20 17

-317

-2 3

,=1-2 3

,=1 3.

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.

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