Toán Lớp 6: Tính một cách hợp lý :(134-34)×(-28)+72×[(-55)-45]
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Toán Lớp 6: Tính một cách hợp lý :(134-34)×(-28)+72×[(-55)-45]
Comments ( 2 )
(134 – 34) xx (-28) + 72 xx (-55 – 45)
= 100 xx (-28) + 72 xx (-100)
= 100 xx (-28) + (-72) xx 100
= 100 xx [-28 + (-72)]
= 100 xx (-100)
= -10000
$\text{( 134 – 34 ) × ( -28 ) + 72 × [ ( -55 ) – 45 ]}$
$\text{= 100 × ( -28 ) + 72 × ( -100 )}$
$\text{= 100 × ( -28 ) + ( -72 ) × 100}$
$\text{= 100 × [ ( -28 ) + ( -72 )}$
$\text{= 100 × ( -100 )}$
$\text{= -10 000 }$