1樓:猴鉸戎
(1)3.4÷[(1.2+0.5)×5],=3.4÷[1.2×5+0.5×5],
=3.4÷[6+2.5],
=3.4÷8.5,
=0.4;
(2)1.9+19.9+199.
9+0.3,=1.9+19.
9+199.9+(0.1+0.
1+0.1),=(1.9+0.
1)+(19.9+0.1)+(199.
9+0.1),=2+20+200,
=222.
脫式計算(能簡算的要簡算) 3.4÷[(1.2+0.5)×5] 1.9+19.9
2樓:米色長裙
(1)3.4÷[(1.2+0.5)×5],=3.4÷[1.2×5+0.5×5],
=3.4÷[6+2.5],
=3.4÷8.5,
=0.4;
(2)1.9+19.9+199.
9+0.3,=1.9+19.
9+199.9+(0.1+0.
1+0.1),=(1.9+0.
1)+(19.9+0.1)+(199.
9+0.1),=2+20+200,
=222.
脫式計算(能簡算要簡算)?
3樓:妙酒
3.76+4.25+5.75 +12-
3.27-0.73+ 60.
49-36+5.51,『=(4.25+5.
75)+12-(3.27+0.73)-36+(60.
49+5.51)+3.76
=10+12-4-36+66+3.76
=51.76
4樓:老任
解:1 . 3.76+4.25+5.75
=3.76+(4.25+5.75)
=3.76+10
=13.76
2. 12-3.27-0.73
=12-(3.27+0.73)
=12-4
=83. 60.49-36+5.51
=(60.49+5.51)-36
=66-36=30
5樓:原宇衛香旋
(54+9/13)÷9
36÷【
(5/6-1/3)×3】
5/7+8/7÷2
2-6/13÷9/2-2/3
=(54+9/13)×1/9
=36÷2/3
=5/7+4/7
=2-4/39-2/3
=54×1/9+9/13×1/9
=54=9/7
=2-(4/39+2/3)
=6+1/13
=48/39=16/13
=79/13或6
1/13
【3/5-(2/4-2/5)】÷4
=【3/5-1/10】÷4
=1/2÷4
=1/8
希望我答
幫助純手打辛苦~
脫式計算,(能簡便的要簡便)3.82÷0.2-0.2×2.5,2.4×1.58+6.6×1.58+1.58,0.48×6.5+5.2×0.65
6樓:匿名使用者
3.82÷0.2-0.2×2.5
=38.2÷2-0.5=19.
1-0.5=18.62.
4×1.58+6.6×1.
58+1.58
=1.58x(2.4+6.
6+1)=1.58x10=15.80.
48×6.5+5.2×0.
65=4.8×0.65+5.
2×0.65
=(4.8+5.2)×0.
65=10×0.65=6.512.
4-12.4×0.25=12.
4×(1-0.25)=12.4×3/4=3.
1×3=9.3七分之五-(七分之五-二分之一)=5/7-5/7+1/2=1/20.125×9+1÷8
=9x1/8+1x1/8=(9+1)x1/8=5/4
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