帮我出20道简便计算,每种方法都有点,但不能太难.?
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75×102
=75*(100+2)
=75*100+75*2
=7500+150
=7650
1.2×2.5
=(1+0.2)*2.5
=1*2.5+0.2*2.5
=2.5+0.5
=3
90.1-9.9
=(90+0.1)-(10-0.1)
=90+0.1-10+0.1
=80+0.2
=80.2
3.54×99+3.54
=3.54*99+3.54*1
=3.54*(99+1)
=3.54*100
=354
272÷125
=272*8/125*8
=2176/1000
=2.176
201+202+203+204+•••+1000
=(201+1000)+(202+999)+.+(600+601)
=400个1201相加
=400*1201
=480400
4/5X3.5+5.5X50%+0.8
解,得:
==0.8*3.5+5.5*0.5+0.8
==0.8*(3.5+1)+5.5*0.5
==0.8*4.5+5.5*(0.8-0.3)
==0.8*4.5+5.5*0.8-0.3*5.5
==(4.5+5.5)*0.8-0.3*5.5
==10*0.8-0.3*5.5
==8-1.65
==6.35
6/7X(4/5-1/3)÷3/5
解,得:
==(6/7)X(7/15)*(5/3)
==2/3
0.25X3.2X1.25
解,得:
==0.25X0.4*(8X1.25 )
==0.1*10
==1
1.56×1.7+0.44×1.7-0.7
11.72-7.85-(1.26+0.46)
10.64+7.65×2.4+11.76
12.9÷〔14.66-(1.3+8.2)〕
9.83×(3.8-2.3)+1.5×6.17
6.752-〔4.7×(0.54-0.38)+2.8〕
15.4÷〔8×(6.34-4.59)〕
7000÷125=(7000×8)÷(125×8)
6400÷800=(6400÷100)÷(800÷100)
125×93×8
8×(500+125)
47×163+37×47
4000÷125
650÷25+26×99
17×101+83
17×99-83
125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)
3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)
12.3-2.45-5.7-4.55 2 + 0.125×0.25×64
64.2×87+0.642×1300 78×36+7.8×741-7 17+ 8
0.125× +0.5
42 +4.58 -43
25÷100
25-3 -(2 -1 )
72×156-56×72
25×32×125
709×99+709
0.25×48
2.5×0.4×2
2×6.6+2.5×6
75.3×99+75.3
4.6×3.7+54×0.37
0.125×+×8.25+12.5%
11―6―1
15―4.25―5
19.82―6.57―3.43
4.6+3+6+5.4
4+2.25+5+7
9.63÷2.5÷4
8.37-3.25-(1.37+1.75,9,
风飘飘的hhgz 举报
好凌乱!!! 采纳吧!,
=75*(100+2)
=75*100+75*2
=7500+150
=7650
1.2×2.5
=(1+0.2)*2.5
=1*2.5+0.2*2.5
=2.5+0.5
=3
90.1-9.9
=(90+0.1)-(10-0.1)
=90+0.1-10+0.1
=80+0.2
=80.2
3.54×99+3.54
=3.54*99+3.54*1
=3.54*(99+1)
=3.54*100
=354
272÷125
=272*8/125*8
=2176/1000
=2.176
201+202+203+204+•••+1000
=(201+1000)+(202+999)+.+(600+601)
=400个1201相加
=400*1201
=480400
4/5X3.5+5.5X50%+0.8
解,得:
==0.8*3.5+5.5*0.5+0.8
==0.8*(3.5+1)+5.5*0.5
==0.8*4.5+5.5*(0.8-0.3)
==0.8*4.5+5.5*0.8-0.3*5.5
==(4.5+5.5)*0.8-0.3*5.5
==10*0.8-0.3*5.5
==8-1.65
==6.35
6/7X(4/5-1/3)÷3/5
解,得:
==(6/7)X(7/15)*(5/3)
==2/3
0.25X3.2X1.25
解,得:
==0.25X0.4*(8X1.25 )
==0.1*10
==1
1.56×1.7+0.44×1.7-0.7
11.72-7.85-(1.26+0.46)
10.64+7.65×2.4+11.76
12.9÷〔14.66-(1.3+8.2)〕
9.83×(3.8-2.3)+1.5×6.17
6.752-〔4.7×(0.54-0.38)+2.8〕
15.4÷〔8×(6.34-4.59)〕
7000÷125=(7000×8)÷(125×8)
6400÷800=(6400÷100)÷(800÷100)
125×93×8
8×(500+125)
47×163+37×47
4000÷125
650÷25+26×99
17×101+83
17×99-83
125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)
3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)
12.3-2.45-5.7-4.55 2 + 0.125×0.25×64
64.2×87+0.642×1300 78×36+7.8×741-7 17+ 8
0.125× +0.5
42 +4.58 -43
25÷100
25-3 -(2 -1 )
72×156-56×72
25×32×125
709×99+709
0.25×48
2.5×0.4×2
2×6.6+2.5×6
75.3×99+75.3
4.6×3.7+54×0.37
0.125×+×8.25+12.5%
11―6―1
15―4.25―5
19.82―6.57―3.43
4.6+3+6+5.4
4+2.25+5+7
9.63÷2.5÷4
8.37-3.25-(1.37+1.75,9,
风飘飘的hhgz 举报
好凌乱!!! 采纳吧!,
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