8+2-8+2 25×4÷25×4
1
5
×5÷
1
5
×5
26-0.75+0.25
7.26-(5.26-1.5) 286+198 314-202 526+301
223-99 6.25+3.85-2.125+3.875 9-24÷56×21 98×58+58+58.
分析:(1)(2)(3)(4)(10)按照從左到右的順序計算計算,注意要弄清楚運(yùn)算的順序,不要用錯的運(yùn)算定律;
(5)先去括號,再計算,去括號時注意運(yùn)算符號的變化;
(6)(7)(8)(9)運(yùn)用湊整法簡算;
(11)先算除法,再算乘法,最后算減法;
(12)運(yùn)用乘法分配律簡算.
解答:解:(1)8+2-8+2,
=10-8+2,
=2+2,
=4;

(2)25×4÷25×4,
=100÷25×4,
=4×4,
=16;

(3)
1
5
×5÷
1
5
×5,
=1÷
1
5
×5,
=5×5,
=25;

(4)26-0.75+0.25,
=25.25+0.25,
=25.5;

(5)7.26-(5.26-1.5),
=7.26-5.26+1.5,
=22+1.5,
=23.5;

(6)286+198,
=286+200-2,
=486-2,
=484;

(7)314-202,
=314-200-2,
=114-2,
=112;

(8)526+301,
=526+300+1,
=826+1,
=827;

(9)223-99,
=223-100+1,
=123+1,
=124;

(10)6.25+3.85-2.125+3.875,
=10.1-2.125+3.875,
=7.975+3.875,
=11.85;

(11)9-24÷56×21,
=9-
3
7
×21,
=9-9,
=0;

(12)98×58+58+58,
=(98+1+1)×58,
=100×58,
=5800.
點評:完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡便方法計算,注意不要錯用運(yùn)算定律.
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