1樓:鄭雨328丶
(1)25×45.1
=25×(45+5.1),
=25×45+25×5.1,
=155+2.5,
=152.5;
(2)12.5×手.2
=12.5×5.8×4,
=15×4,
=45;
(手)155.t8÷t
=(tt+1.t8)÷t.
=tt÷t+1.t8÷t,
=11+5.22,
=11.22;
(4)(5.25+5.25+5.25)×4=手×(5.25×4),
=手×1,
=手;(5)5.84÷2.5÷5.4
=5.84÷(2.5×5.4),
=5.84÷1,
=5.84.
遞等式計算,能簡便計算的一定要簡便計算.25×40.1 12.5×3.2 100.98÷9 (0.25+0.25+0.25)×4
2樓:手機使用者
(1)25×40.1
=25×(zhi40+0.1),
dao=25×40+25×0.1,
=100+2.5,
=102.5;專
(2)12.5×3.2
=12.5×0.8×4,
=10×4,
=40;
(3)100.98÷9
=(99+1.98)÷9.屬
=99÷9+1.98÷9,
=11+0.22,
=11.22;
(4)(0.25+0.25+0.25)×4=3×(0.25×4),
=3×1,
=3;(5)5.64÷2.5÷0.4
=5.64÷(2.5×0.4),
=5.64÷1,
=5.64.
用遞等式計算(能簡便計算的用簡便方法計算):(1)4.2÷0.25(2)1.46+(7.7+0.54)+2.3(3)(4.77+1.
3樓:妙酒
(1)4.2÷0.25
=4.2x4÷(copy0.25x4)
=16.8÷1
=16.8
(2)1.46+(7.7+0.54)+2.3=(1.46+0.54)+(7.7+2.3)=2+10
=12(3)(4.77+1.3)×(7-4.8÷8)=6.07x(7-0.6)
=6.07x6.4
=6x6.4+0.07x6.4
=38.4+0.448
=38.848
(4)0.7÷【(0.7+0.7)×0.7-0.7】=0.7÷(1.4-1)÷0.7
=1÷0.4
=2.5
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