Toán Lớp 8: 1. Tính bằng cách thuận tiện: 60 – 26,75 – 13,25 38,25 – 18,25 + 21,64 – 11,64 + 9,93 45,28 + 52,17 – 15,28 – 12,17 (72,69 + 18,47 ) – ( 8,47 + 22,69 )
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Toán Lớp 8: 1. Tính bằng cách thuận tiện: 60 – 26,75 – 13,25 38,25 – 18,25 + 21,64 – 11,64 + 9,93 45,28 + 52,17 – 15,28 – 12,17 (72,69 + 18,47 ) – ( 8,47 + 22,69 )
Comments ( 2 )
= 60 – ( 26,75 + 13,25 )
=60 – 40
= 20
= ( 38,25 – 18,25) + ( 21,64 – 11,64) + 9,93
= 20 + 10 + 9,93
= 30 + 9,93
= 39,93
= ( 45,28 – 15,28 ) + ( 52,17 – 12,17 )
= 30 + 40
= 70
(72,69 + 18,47 ) – ( 8,47 + 22,69 )
= 72,69 + 18,47 – 8,47 – 22,69
= (72,69 – 22,69) + (18,47 – 8,47)
= 50 + 10
= 60