計算下面各題,怎樣簡便就怎樣算。寫過程0 072 87 5 8 75 0 28 7 5 2 5

2021-05-21 19:10:09 字數 1248 閱讀 9585

1樓:雪中送炭新野

計算下面各題,怎樣簡便就怎樣算。 寫過程

0.072×87.5+8.75×0.28

=0.72×8.75+8.75×0.28

=(0.72+0.28)×8.75

=1×8.75

=8.75

7.5÷2.5÷0.4

=7.5÷(2.5×0.4)

=7.5÷1

=7.5

7/8÷9×3/5÷35/72

=(7/8×3/5)÷(9×35/72)

=21/40÷35/8

=21/40×8/35

=3/25

2樓:小橋阿水

0.072×

87.5+8.75×0.28

=0.72×0.1×87.5+8.75×0.28=(0.72+0.28)×8.75

=1×8.75

=8.75

7.5÷2.5÷0.4

=7.5÷(2.5×0.4)

=7.5÷1

=7.5

7/8÷9×3/5÷35/72

=7/8×72/35×1/9×3/5

=3/25

計算下面各題,怎樣計算簡便就怎樣計算.4.56+3.28+6.72+0.44 57×101 87×99+87 84×72+84×29+84

3樓:

(1)4.56+3.28+6.72+0.44,=(4.56+0.44)+(3.28+6.72),=5+10,

=15;

(2)57×101,

=57×(100+1),

=57×100+57×1,

=5700+57,

=5757;

(3)87×99+87,

=87×(99+1),

=87×100,

=8700;

(4)84×72+84×29+84,

=84×72+84×29+84×1,

=84×(72+29+1),

=84×102,

=8568;

(5)62.4-38.85-11.15,

=62.4-(38.85+11.15),

=62.4-50,

=12.4;

(6)(68-47)×24÷12,

=21×24÷12,

=21×(24÷12),

=21×2,

=42.

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