1樓:龍軍
(1)0.36÷[(6.1-4.6)×0.8]=0.36÷[1.5×0.8]
=0.36÷1.2
=0.3;
(2)92.4-12.4×5
=92.4-62
=30.4;
(3)0.75÷0.25÷4
=0.75÷(0.25×4)
=0.75÷1
=0.75;
(4)8.4×6.42-3.4×6.42
=6.42×(8.4-3.4)
=6.42×5
=32.1.
脫式計算(能簡算的要簡算
2樓:軒胤
(1)6.72-2.3÷0.5×0.8
=6.72-4.6×0.8
=6.72-3.68
=3.04;
(2)98-1
7+18-6
7=(98+1
8)-(17+6
7)=54
-1=14;
(3)9
10÷[1
2×(65-3
10)]
=910
÷[12
×910]=9
10÷9
20=2;
(4)(27+1
5)×7×5=27
×7×5+1
5×7×5
=10+7
=17.
用遞等式計算,能簡算的要寫出簡算過程. (2.5×6+2.5×4)÷5 35.6-2.8+4.4-7.2 0.25×3.2×12.
3樓:最強黑客
(1)(2.5×6+2.5×4)÷5,
=2.5×(6+4)÷5,
=2.5×10÷5,
=25÷5,
=5;(2)35.6-2.8+4.4-7.2,=(35.6+4.4)-(2.8+7.2),=40-10,
=30;
(3)0.25×3.2×12.5,
=0.25×4×0.8×12.5,
=(0.25×4)×(0.8×12.5),=1×10,
=10;
(4)7.5÷(1.5+2.5),
=7.5÷4,
=1.875;
(5)0.6×(5+0.6)-1,
=0.6×5+0.6×0.6-1,
=3+0.36-1,
=3.36-1,
=2.36;
(6)3.7×1.25-3.7×0.25,=3.7×(1.25-0.25),
=3.7×1,
=3.7.
用遞等式進行計算,能簡便的要簡便簡便計算.7.29×4.6+46×1.271(28.7-18.6÷3.1)×0.816-5.32-4.6840
4樓:尼古丁
(1)7.29×4.6+46×1.271,=7.29×4.6+4.6×12.71,
=(7.29+12.71)×4.6,
=20×4.6,
=92;
(2)(28.7-18.6÷3.1)×0.8,=(28.7-6)×0.8,
=22.7×0.8,
=18.16;
(3)16-5.32-4.68,
=16-(5.32+4.68),
=16-10,
=6;(4)40.8+14.7÷(14.6-12.5),=40.8+14.7÷2.1,
=40.8+7,
=47.8;
(5)3.7×0.125+6.3÷8,
=3.7×0.125+6.3×1 8
,=(3.7+6.3)×0.125,
=1.25;
(6)0.72+9.6÷3.2,
=0.72+3,
=3.72.
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