Bài 4. Tính nhanh
a, (– 27).( – 28) + (– 27).128
c, (– 59).(– 43) – 59.53
b, (– 32).( – 56) + 32.44
d, (– 2) ³.(-8)+ $2^{4}$
Bài 4. Tính nhanh
a, (– 27).( – 28) + (– 27).128
c, (– 59).(– 43) – 59.53
b, (– 32).( – 56) + 32.44
d, (– 2) ³.(-8)+ $2^{4}$
a. (– 27).( – 28) + (– 27).128
= -27 . (-28 + 128)
= -27 . 100
= -2700
b. (-59).(– 43) – 59.53
= -59 . (-43 + 53)
= -59 . 10
= -590
c. (– 32).( – 56) + 32.44
= 32 . 56 + 32 . 44
= 32 . (56 + 44)
= 32 . 100
= 3200
d.(– 2) mũ 3 . (-8) + 2 mũ 4
= -8 . (-8) + 16
= 64 + 16
= 80
Đáp án+Giải thích các bước giải:
$a, (– 27).( – 28) + (– 27).128\\=(-27).(-28+128)\\=(-27).100\\=-2700$
$b, (– 32).( – 56) + 32.44\\=32.56+32.44[\text{ vì (– 32).(– 56)=32.56}]\\=32.(56+44)\\=32.100\\=3200$
$c, (– 59).(– 43) – 59.53\\=59.43-59.53 [\text{ vì (– 59).(– 43)=59.43}]\\=59.(43-53)\\=59.(-10)\\=-590$
$d,(-2)^3.(-8)+2^4\\=(-8).(-8)+16\\=64+16\\=80$