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(1)2436+570÷19×12(2)36÷4.5-1.6*0.5(3)7/15÷2/5*4/7-4/7(4)(1/15+3/49)*15-45/49
题目详情
(1)2436+570÷19×12 (2)36÷4.5-1.6*0.5
(3)7/15÷2/5*4/7-4/7 (4)(1/15+3/49)*15-45/49
(3)7/15÷2/5*4/7-4/7 (4)(1/15+3/49)*15-45/49
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答案和解析
(1)2436+570÷19×12
=2436+30X12
=2436+360
=2796
(2)36÷4.5-1.6*0.5
=8-0.8
=7.2
(3)7/15÷2/5*4/7-4/7
=(4/7)*[(7/15)*(5/2)-1]
=(4/7)*(7/6-1)
=2/21
(4)(1/15+3/49)*15-45/49
=1+45/49-45/49
=1
=2436+30X12
=2436+360
=2796
(2)36÷4.5-1.6*0.5
=8-0.8
=7.2
(3)7/15÷2/5*4/7-4/7
=(4/7)*[(7/15)*(5/2)-1]
=(4/7)*(7/6-1)
=2/21
(4)(1/15+3/49)*15-45/49
=1+45/49-45/49
=1
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