1樓:之蘿蘿蔔
(1)33.5-5.3-4.7+16.5,=(33.5+16.5)-(5.3+4.7),=50-10,
=40;
(2)9900÷25÷4,
=9900÷(25×4),
=9900÷100,
=99;
(3)1÷(3 5
+310
),=1÷9
10,=10 9
;(4)24×(2 3
+1 6
-3 8
),=24×2 3
+24×1 6
-24×3 8
,=16+4-9,
=20-9,
=11;
(5)1+0.45÷0.9-7 8
,=1+0.5-7 8
,=1.5-7 8
,=0.625;
(6)20
17-(3
17+2 3
),=20 17
-317
-2 3
,=1-2 3
,=1 3.
脫式計算.(能簡算的要簡算)①1÷0.25+0.25÷1-2.5×0.1②1+2+3+4+5+6+5+4+3+2+16666662③22×4+24×6+
2樓:度鍍
①1÷0.25+0.25÷1-2.5×0.1,=4+0.25-0.25,
=4+(0.25-0.25),
=4+0,
=4;②1+2+3+4+5+6+5+4+3+2+16666662
,=36
6666662
,=18×2
3333331×2
,=18
3333331;③2
2×4+2
4×6+2
6×8+2
8×10
+210×12,=1
2-14+1
4-16+1
6-18+1
8-110+1
10-112,
=12-112,=5
12;④1÷(1-0.99)-99÷(1-0.999),=1÷0.01-99÷0.001,
=100-99000,
=-98900.
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