1樓:過去
(1)275+450÷18×24,
=275+25×24,
=275+(25×4)×6,
=275+600,
=875;
(2)1.46+29+371+8.54,
=(1.46+8.54)+(29+371),=10+400,
=410;
(3)1
4÷(3-5
19-14
19),=14
÷[3-(5
19+14
19)],=14
÷[3-1],=14
÷2,=18;
(4)19.9+19.9×99,
=19.9×(99+1),
=19.9×100,
=1990;
(5)3
10+(67?1
2)×725,
=310+67
×725?12
×725,=3
10+6
25?750,
=310
+(12
50?7
50),
=310
+110,=2
5;(6)888×9+28×111,
=111×8×9+28×111,
=111×72+28×111,
=111×(72+28),
=111×100,
=11100.
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.
脫式計算.(能簡算的要簡算)(1)12.75-517+114-1217(2)[1-(15+0.3)]
3樓:手機使用者
(1)12.75-5
17+11
4-1217,
=(12.75+11
4)-(5
17+12
17),
=14-1,
=13;
(2)[1-(1
5+0.3)]÷18,
=[1-0.5]÷18,
=0.5÷18,
=4;(3)2
9×40%+79÷5
2,=(29+79
)×40%,
=1×40%,
=0.4;
(4)1.25×3.2×2.5,
=(1.25×8)×(0.4×2.5),
=10×1,
=10.
脫式計算(能簡算的要簡算) ⑴1/4÷(2/3-3/2×1/3) ⑵24×(1/6+3/8+7/
4樓:昨夜星辰吉日
⑴1/4÷(2/3-3/2×1/3)
=1/4÷(2/3-1/2)=1/4÷(4/6-3/6)=1/4÷1/6=1/4x6=6/4=3/2;
⑵24×(1/6+3/8+7/12)=24x1/6+24x3/8+24x7/12=4+9+14=27;
⑶1/8×58+1/8×41+1/8=1/8x(58+41+1)=1/8x100=100/8=12.5.
5樓:
⑴1/4÷(2/3-3/2×1/3)=3/2
⑵24×(1/6+3/8+7/12)=27
⑶1/8×58+1/8×41+1/8=25/2
6樓:匿名使用者
(1)1/4÷(2/3一3/2×1/3)=1/4÷(4/6一3/6)=1/4×6/1=3/2
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