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请用简便方法计算下面各题245-65-35186+82+18-8625×(4×27)8×(25+20)24×56+44×24700÷4÷25389-(289+27)562+306432-205125×24×8×372×9942×10242×19+4236×101-3636×46+36×36+36×18179-64-36+2147×121-21×4725×36

题目详情
请用简便方法计算下面各题
245-65-35186+82+18-8625×(4×27)8×(25+20)
24×56+44×24700÷4÷25389-(289+27)562+306
432-205125×24×8×372×9942×102
42×19+4236×101-3636×46+36×36+36×18179-64-36+21
47×121-21×4725×36
▼优质解答
答案和解析
(1)245-65-35
=245-(65+35)
=245-100
=145;

(2)186+82+18-86
=(186-86)+(82+18)
=100+100
=200;

(3)25×(4×27)
=25×4×27
=100×27
=2700;
(4)8×(25+20)
=8×25+8×20
=200+160
=360;

(5)24×56+44×24
=24×(56+44)
=24×100
=2400;

(6)700÷4÷25
=700÷(4×25)
=700÷100
=7;

(7)389-(289+27)
=389-289-27
=100-27
=73;
(8)562+306
=562+300+6
=862+6
=868;

(9)432-205
=432-200-5
=232-5
=227;

(10)125×24×8×3
=(125×8)×(24×3)
=1000×72
=72000;

(11)72×99
=72×(100-1)
=72×100-72
=7200-72
=7428;

(12)42×102
=42×(100+2)
=42×100+42×2
=4200+84
=4284;

(13)42×19+42
=42×(19+1)
=42×20
=840;

(14)36×101-36
=36×(100+1)-36
=36×100+36-36
=36×100
=3600;

(15)36×46+36×36+36×18
=36×(46+36+18)
=36×100
=3600;

(16)179-64-36+21
=(179+21)-(64+36)
=200-100
=100;

(17)47×121-21×47
=47×(121-21)
=47×100
=4700;

(18)25×36
=25×4×9
=100×9
=900.