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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