1樓:匿名使用者
3.6÷【1.8×(3.4-2.9)】
=3.6÷【1.8×0.5】
=3.6÷1.8÷0.5
=2÷0.5=4
下面各題能簡算的要用簡便計算.1.36+4.85+2.64+6.15 98.5÷2.5÷4 5.4÷[2.5×(3.7-2.9)]0.8×(4-3.6
2樓:□小千
(1)1.36+4.85+2.64+6.15,=(1.36+2.64)+(4.85+6.15),=4+11,
=15;
(2)98.5÷2.5÷4,
=98.5÷(2.5×4),
=98.5÷10,
=9.85;
(3)5.4÷[2.5×(3.7-2.9)],=5.4÷[2.5×0.8],
=5.4÷2,
=2.7;
(4)0.8×(4-3.68)÷0.01,=0.8×0.32÷0.01,
=0.256÷0.01,
=25.6;
(5)83.7-12.83-0.17,
=83.7-(12.83+0.17),
=83.7-13,
=70.7;
(6)5.96+13×(3.2-3.12),=5.96+13×0.08,
=5.96+1.04,=7.
解方程
3樓:榮錳繳
(1)x-2.6=4.7
x-2.6+2.6=4.7+2.6
x=7.3;
(2)x÷18=3.6
x÷18×18=3.6×18
x=64.8;
(3)2x+3.4=9.6
2x+3.4-3.4=9.6-3.4
2x÷2=6.2÷2
x=3.1;
(4)3x-6×12=24
3x-72+72=24+72
3x÷3=96÷3
x=32;
(5)6.8x-0.8x=0.48
6x=0.48
6x÷6=0.48÷6
x=0.08;
(6)5(16-x)=35
5(16-x)÷5=35÷5
16-x+x=7+x
16-7=7+x-7
x=9.
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