脫式計算

2021-03-04 01:38:36 字數 1335 閱讀 7042

1樓:低調の二爺

(1)240÷2×襲5,

=120×5,bai

=600;

(du2)(

zhi111-75)×13,dao

=36×13,

=468;

(3)400-128÷4,

=400-32,

=368;

(4)(45+54)÷3,

=99÷3,

=33;

(5)25×4×15,

=100×15,

=1500;

(6)1600-85×12,

=1600-1020,

=580.

脫式計算.(1)120×3×5 (2)(36+24)×7 (3)350+15×4 (4)72÷9×25 (5)215-35×4 (6

2樓:隕落

(1)120×

3×5=360×5

=1800;

(2)(36+24)×7

=60×7

=420;

(3)350+15×4

=350+60

=410;

(4)72÷9×25

=8×25

=200;

(5)215-35×4

=215-140

=75;

(6)754×(2×3)

=754×6

=4524.

脫式計算,4/5÷[8×(1/2-2/5)],[1-(1/4+3/8)]÷1/4?

3樓:匿名使用者

4/5÷[8×

(1/2-2/5)]

=4/5÷[8×1/10]

=4/5÷4/5

=1[1-(1/4+3/8)]÷1/4

=[1-5/8]÷1/4

=3/8÷1/4

=3/2

9×13×(5/13+5/9)

=9×13×5/13+9×13×5/9

=45+65

=110

4樓:妙酒

4/5÷[8×(1/2-2/5)]

=4/5÷(8x1/10)

=4/5÷4/5

=1[1-(1/4+3/8)]÷1/4

=(1-5/8)x4

=3/8x4

=3/2

9×13×(5/13+5/9)

=9x13x5/13+9x5/9x13

=9x5+5x13

=5x(9+13)

=5x22

=110

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