你能想出简便方法来计算下面各题吗?25×5+74×5+5 6.74+12.62+24.38+3.26 87-2.123-0.877 30.65-(
你能想出简便方法来计算下面各题吗?25×5+74×5+56.74+12.62+24.38+3.2687-2.123-0.87730.65-(7.65+5.4)(40+8)...
你能想出简便方法来计算下面各题吗?25×5+74×5+5 6.74+12.62+24.38+3.26 87-2.123-0.877 30.65-(7.65+5.4) (40+8)×125 32×38+32×62.
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(1)25×5+74×5+5,
=(25+74+1)×5,
=100×5,
=500;
(2)6.74+12.62+24.38+3.26,
=(6.74+3.26)+(12.62+24.38),
=10+37,
=47;
(3)87-2.123-0.877,
=87-(2.123+0.877),
=87-3,
=84;
(4)30.65-(7.65+5.4),
=30.65-7.65-5.4,
=23-5.4,
=17.6;
(5)(40+8)×125,
=40×125+8×125,
=5000+1000,
=6000;
(6)32×38+32×62,
=32×(38+62),
=32×100,
=3200.
=(25+74+1)×5,
=100×5,
=500;
(2)6.74+12.62+24.38+3.26,
=(6.74+3.26)+(12.62+24.38),
=10+37,
=47;
(3)87-2.123-0.877,
=87-(2.123+0.877),
=87-3,
=84;
(4)30.65-(7.65+5.4),
=30.65-7.65-5.4,
=23-5.4,
=17.6;
(5)(40+8)×125,
=40×125+8×125,
=5000+1000,
=6000;
(6)32×38+32×62,
=32×(38+62),
=32×100,
=3200.
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