Toán Lớp 5: d) ( – 12) x 47 + (-12) x 52 + (-12)
e) 13 x (23+22) -3 x ( 17+28)
f) -48 + 48 x (-78) + 48 x (-21)
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Toán Lớp 5: d) ( – 12) x 47 + (-12) x 52 + (-12)
e) 13 x (23+22) -3 x ( 17+28)
f) -48 + 48 x (-78) + 48 x (-21)
Comments ( 2 )
Giải đáp:
d, (-12) x 47 + (-12) x 52 + (-12) = (-12) x (47+52+1) = (-12) x 100= -1200
e) 13 x (23+22) -3 x ( 17+28) = 13 x 45 – 3 x 45 = 45 x (13-3) = 45 x 10 = 450
f) -48 + 48 x (-78) + 48 x (-21) = 48 x (-78+-21+-1) = 48 x -100 = -4800
Cho mình ctlhn nha
d) ( -12 ). 47 + ( -12 ). 52 + (-12 )
= ( -12 ). ( 47 + 52 + 1 )
= ( -12 ). 100
= -1200
e) 13 × ( 23 + 22 ) – 3 × ( 17 + 28 )
= 13 × 45 – 3 × 45
= 45 × 10
= 450
f) -48 + 48 × ( -78 ) + 48 × ( -21 )
= -48 + ( -48 ) × 78 + ( -48 ) × 21
= -48 × ( 1 + 78 + 21 )
= -48 × 100
= -4800
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