Toán Lớp 5: (20,15 x 0,7 – 20,15 x 0,69) x (31,1 x 11 – 311 x 0,1 – 310)
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Toán Lớp 5: (20,15 x 0,7 – 20,15 x 0,69) x (31,1 x 11 – 311 x 0,1 – 310)
Comments ( 2 )
=[ 20,15 ×( 0,7 – 0,69) ] × [ 31,1 × 11 – ( 311 × 0,1 ) – 310 ]
=( 20,15 × 0,01 × ( 31,1 × 11 – 31,1 – 310 )
= 0,2015 × [ 31,1 × ( 11 – 1) – 310 ]
= 0,2015 × ( 31,1 × 10 – 310 )
= 0,2015 × ( 311 – 310 )
= 0,2015 × 1
= 0,2015
có gì không hiểu cứ hỏi