1樓:德弘秋梵
(1)4.8×0.25,
=1.2×4×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;
(2)2.33×0.5×4,
=2.33×(0.5×4),
=2.33×2,
=4.66;
(3)1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;(4)50.4×1.9-1.9,
=(50.4-1)×1.9,
=49.4×1.9,
=93.86;
(5)3.7×0.25+4,
=0.925+4,
=4.925;
(6)0.65×201,
=0.65×(200+1),
=0.65×200+0.65×1,
=130+0.65,
=130.65.
用遞等式計算。(能簡便計算的用簡便方法計算) 2.5×(3.8×0.4)
2樓:凌月霜丶
2.5×(3.8×0.4) 4.6×0.33+5.4×0.33
= 3.8*(2.5*0.4) =0.33*(4.6+5.4)
=3.8*1 =0.33*10
=3.8 =3.3
0.25×39+0.25 8.36-2.48-3.52
= 0.25*(39+1) =8.36-(2.48+3.52)
= 0.25*40 =8.36-6
=10 =2.36
3樓:
2.5×(3.8×0.4)
= 2.5x0.4x3.8
=1x3.8
= 3.8
4.6×0.33+5.4×0.33
=(4.6+5.4)x0.33
=10x0.33
=3.3;
0.25×39+0.25
=0.25x(39+1)
=0.25x40
=10;
8.36-2.48-3.52
=8.36-(2.48+3.52)
=8.36-6
=2.36.
供參考。
5.2×4+4.8÷0.25怎麼簡便計算
4樓:妙酒
5.2×4+4.8÷0.25
=5.2x4+4.8x4
=(5.2+4.8)x4
=10x4
=40,
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遞等式計算.(能用簡便演算法的用簡便方法計算) 1.5×105; 2.33×0.5×4 2.05÷0.82+33.6
5樓:康千厹
(1)1.5×105
=1.5×(100+5),
=1.5×100+1.5×5,
=150+7.5,
=157.5;
(2)2.33×0.5×4
=2.33×(0.5×4),
=2.33×2,
=4.66;
(3)2.05÷0.82+33.6
=2.5+33.6,
=36.1;
(4)9.07-22.78÷3.4
=9.07-6.7,
=2.37.
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