1樓:匿名使用者
=5.7+14.75+2.
77-8-6.87+2.5/47.
23=5.7+2.77+14.
75-14.87+0.05=5.
7+2.65+0.05
=8.4
脫式計算,能簡算的要簡算: 46.5×99+46.5 12.5÷2.5÷0.4 2.6×1.9÷2.6×1.9 (7.7+1.54)
2樓:手機使用者
(1)46.5×99+46.5
=46.5×(99+1)
=46.5×100
=4650
(2)12.5÷2.5÷0.4
=12.5÷(2.5×0.4)
=12.5÷1
=12.5
(3)2.6×1.9÷2.6×1.9
=2.6÷2.6×1.9×1.9
=1×1.9×1.9
=3.61
(4)(7.7+1.54)÷0.7
=9.24÷0.7
=13.2
(5)10.8÷[(4.62-1.92)×4]=10.8÷[2.7×4]
=10.8÷10.8
=1(6)2.6×(2.139÷9.3×6.2)=2.6×(0.23×6.2)
=2.6×1.426
=3.7076
脫式計算,能簡算的要簡算.①(35+13)÷75+14②29+5.28+79+4.72③85.7×16+14.3×16④2+48%÷
3樓:流星
①(35+13
)÷75+14
,=14
15÷75+1
4,=23
+14,=1112;
②29+5.28+7
9+4.72,
=(29+79
)+(5.28+4.72),
=1+10,
=11;
③85.7×
內16+14.3×16,
=(85.7+14.3)×容16,
=100×16,
=1600;
④2+48%÷0.6-34,
=2+0.8-34,
=2.8-0.75,
=2.05.
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+
4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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