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.
74計算下面各題怎樣算簡便就怎樣算
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