(1)(-4)×(-8); (2)36÷(-9); (3)48
(4)(+22)×(-33)×(-4)×0; (5)(-32)÷4×(-8); (6)75÷(-
(7)(-
(8)-32-(-2)2; (9)2×(-3)2-5÷
(10)-125÷(-25)-64÷(-4). |
(1)(-4)×(-8)
=4×8
=32;
(2)36÷(-9)
=-36÷9
=-4;
(3)48
×(-5)24 25
=(49-
)×(-5)1 25
=49×(-5)-
×(-5)1 25
=-245+1 5
=-244
;4 5
(4)(+22)×(-33)×(-4)×0=0;
(5)(-32)÷4×(-8)
=(-8)×(-8)
=64;
(6)75÷(-
)×(-2 3
)3 2
=75×
×3 2 3 2
=
;675 4
(7)(-
)×0.125×(-23 7
)×(-8)1 3
=(-
)×3 7
×(-1 8
)×(-8)7 3
=-1;
(8)-32-(-2)2
=-9-4
=-13;
(9)2×(-3)2-5÷
×21 2
=2×9-5×2×2
=18-20
=-2;
(10)-125÷(-25)-64÷(-4)
=5+16
=21.