脫式計(jì)算.
24+16×11÷8 |
1.25×32×2.5 |
(2.8+3.85÷3.5)×0.2 |
+-+ |
10.9-(+9.6÷4) |
÷[1-(+)]. |
(1)24+16×11÷8,
=24+176÷8,
=24+22,
=46;
(2)1.25×32×2.5,
=1.25×4×8×2.5,
=(1.25×8)×(2.5×4),
=10×10,
=100;
(3)(2.8+3.85÷3.5)×0.2,
=(2.8+1.1)×0.2,
=3.9×0.2,
=0.78;
(4)
+
-
+
,
=(
-
)+(
+
),
=
+1,
=1
;
(5)10.9-(
+9.6÷4),
=10.9-(
+2.4),
=10.9-2.8,
=8.1;
(6)
÷[1-(+)],
=
÷[1-
],
=
÷
,
=5.
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