1樓:手機使用者
(1)9.5×1.06-2.52÷2.4
=10.07-1.05
=9.02;
(2)3.4×0.26+0.74×3.4
=3.4×(0.26+0.74)
=3.4×1
=3.4;
(3)1.25×32×0.8
=(1.25×0.8)×32
=1×32
=32;
(4)7.09×99+7.09
=7.09×(99+1)
=7.09×100
=709;
(5)68.5+31.5÷(0.29+0.41)=68.5+31.5÷0.7
=68.5+45
=113.5;
(6)0.4×5÷0.4×5
=2÷0.4×5
=5×5
=25.
計算下面各題,能簡算的要簡算,並寫出主要的簡算過程.(1)9.06-2.68-0.32(2)(3.06÷0.25+2.76)×0
2樓:褲兜最棒
(1)9.06-2.68-0.32,
=9.06-(2.68+0.32),
=9.06-3,
=6.06;
(2)(3.06÷0.25+2.76)×
0.2,
=(12.24+2.76)×0.2,
=15×0.2,
=3;(3)18-(3
5+4÷25),
=18-(0.6+4×52),
=18-(0.6+10),
=18-10.6,
=7.4;
(4)2.7×1.25+5.3×125%,=2.7×1.25+5.3×1.25,
=(2.7+5.3)×1.25,
=8×1.25,
=10.
計算下面各題,能簡算的要簡算。(脫式計算) (6/35+4/21)÷4/7 2/ 50
3樓:匿名使用者
(6/35+4/21)÷4/7
=6/35×7/4+4/21×7/4
=3/10+1/3
=9/30+10/30
=19/30
2/9÷2/7÷14/15
=2/9×7/2×15/14
=14/18×15/14
=5/6
(5/6-3/4)÷5/12+4/5
=5/6×12/5-3/4×12/5+4/5=2-9/5+4/5
=2-13/5
=-3/5
3/10÷(4/5-1/2)
=3/10×5/4-3/10×2
=3/8-3/5
=15/40-24/40
=-9/40
2/25÷3/7+23/25÷3/7
=(2/25+23/25)÷3/7
=1×7/3
=2又1/3
8/9÷5/6+1/6
=8/9×6/5+1/6
=16/15+1/6
=32/30+5/30
=37/30
=1又7/30
2/3x=16
x=16×3/2
x=24
3/4x+1/4=3/8
3/4x=3/8-1/4
3/4x=1/8
x=1/8×4/3
x=1/6
1/5x-1/2=3/10
1/5x=1/2+3/10
1/5x=8/10
x=8/10×5x=4
4樓:**防騙
6/35x7/4十4/2lx7/4=3/10十1/3=9/30十10/30=19/30
2/9x7/2x1/14=1/185/6
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