Tính S =1,2 +6,5+6,6÷82......98,29+8282
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{5,4-4,4}+{6,5-5,5}+{7,6-6,6}+{8,7-7,7}=1+1+1+1=4
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a)\(37.x6.5-7.5x3.4-6.6x7.5+3.5x37.5\)
=\(7.5x5x6.5-7.5x3.4-6.6x7.5+3.5x7.5x5\)
=\(7.5x\left(5x6.5-3.4-6.6+3.5x5\right)\)
=\(7.5x\left(2x6.5-10\right)\)
=\(7.5x\left(13-10\right)\)
=\(7.5x3\)
=\(22.5\)
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6,5 + 1,2 + 3,5 - 5,2 + 6,5 - 4,8
=(6,5+3,5)+(1,2+6,5)-(5,2+4,8)
=10+7,7-10
=(10-10)+7,7
=7,7
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Phép toán như sau :
6,4 + 1,2 + 3,5 - 5,2 + 6,5 - 4,8
= 7,6 + 3,5 - 5,2 + 6,5 - 4,8
= 11,1 - 5,2 + 6,5 - 4,8
= 5,9 + 6,5 - 4,8
= 12,4 - 4,8
= 7,6
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6 , 5 : 0 , 25 = 6 , 5 × 4
6 , 6 × 7 , 7 < 42 × 1 , 31
0 , 15 × 4 = 0 , 15 : 0 , 25
24 , 17 − 16 , 53 > 23 , 17 − 15 , 67
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