1樓:雲山霧海
2/5+7/25×20%括號乘以25等於用遞等式計算(2/5+7/25×20%)x25
=2/5x25+7/25x25x0.2
=10+1.4
=11.4
用遞等式計算(能簡算的要簡算)72×(18+29) (72.5-6.25)×2÷25 1.7×...
2樓:【痞子
(1)72×(18
+29)=72×zhi18
+72×2
9=9+16
=25;
dao(回2)(72.5-6.25)×答2÷25=66.25×2÷25
=132.5÷25
=5.3;
(3)1.7×8.5+0.83+85
=14.45+0.83+85
=15.28+85
=100.28;
(4)95×3
2-710×3
=2710
-2110=35
;(5)54.6-(8.9-5.4)
=54.6-8.9+5.4
=54.6+5.4-8.9
=60-8.9
=51.1;
(6)265+4
5×(9
10-38)
=265+45
×2140
=265
+2150
=28150.
用遞等式計算(能簡算的要簡便計算) 0.175÷0.25×4.27.52-(7.7-2.48)+32.7.3.2×(2.5+12.5)6.8×
3樓:摯愛慧瑩uj卑
(1)0.175÷0.25×4
=0.7×4
=2.8
(2)27.52-(7.7-2.48)+32.7=27.52-7.7+2.48+32.7
=(27.52+2.48)+(32.7-7.7)=30+25
=55(3)3.2×(2.5+12.5)
=3.2×2.5+3.2×12.5
=0.8×(4×2.5)+0.4×(8×12.5)=0.8×10+0.4×100
=8+40
=48(4)6.8×3.7-3.7+37×0.42=6.8×3.7-3.7+3.7×4.2
=(6.8-1+4.2)×3.7
=10×3.7
=37(5)[(7.6-5.8)×0.8-1]×5.5=[1.8×0.8-1]×5.5
=[1.44-1]×5.5
=0.44×5.5
=2.42
(6)(7.8+2.2×5)÷(4-3.06)=(7.8+11)÷0.94
=18.8÷0.94=20
用遞等式計算(能簡算的要簡算) 5.03-2.5+0.96 35.72-(5.9+5.72) 25-4.7+5.3 1.3+2.83+8.7+0.1
4樓:金仁英
(1)5.03-2.5+0.96,
=2.53+0.96,
=3.49;
(2)35.72-(5.9+5.72),
=35.72-5.9-5.72,
=35.72-5.72-5.9,
=30-5.9,
=24.1;
(3)25-4.7+5.3,
=20.3+5.3,
=25.6;
(4)1.3+2.83+8.7+0.17,=(1.3+8.7)+(2.83+0.17),=10+3,
=13;
(5)2.47-2.2-3.8+7.53,=(2.47+7.53)-(2.2+2.8),=10-5,=5.
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