脫式計算,能簡算的要簡算1 710(

2021-03-17 01:35:31 字數 1199 閱讀 8109

1樓:手機使用者

①1÷[7

10×(1-4

7)],

=1÷[7

10×37],

=1÷310,

=313

;②3.8×99+3.8,

=3.8×(99+1),

=3.8×100,

=3800;

③2700×(506-499)÷900,

=2700×7÷900,

=2700÷900×7,

=3×7,

=21;

④910

÷[12

×(65

-310

)],=9

10÷[12×9

10],

=910

÷920,=9

10×209,

=2;⑤33.02-(148.4-90.85)÷2.5,=33.02-57.55÷2.5,

=33.02-23.02,

=10;

⑥813

÷7+17×5

13,=813×17

+17×513

,=(8

13+5

13)×17,

=17;

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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