【急】!简便运算!(1) 3/4+9 3/4(九又四分之三)+99 3/4(九十九又四分之三)+999 3/4(九百九十
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/06 09:24:54
【急】!简便运算!
(1) 3/4+9 3/4(九又四分之三)+99 3/4(九十九又四分之三)+999 3/4(九百九十九又四分之三)+1
(2)1-1/2-1/4-1/8-1/16-1/32-1/64
(3) 1/3x7+1/7x11+1/11x15+……+1/55x59
(4) 1/6+1/12+1/20+1/30+1/40
(5) 7+77+777+7777+77777
(6) 8×(3.1-2.85)×12.5×(1.62+2.38)
(7)100+99-98+97-96+……+3-2+1
做得了多少就做多少!尽量多做吧!
(1) 3/4+9 3/4(九又四分之三)+99 3/4(九十九又四分之三)+999 3/4(九百九十九又四分之三)+1
(2)1-1/2-1/4-1/8-1/16-1/32-1/64
(3) 1/3x7+1/7x11+1/11x15+……+1/55x59
(4) 1/6+1/12+1/20+1/30+1/40
(5) 7+77+777+7777+77777
(6) 8×(3.1-2.85)×12.5×(1.62+2.38)
(7)100+99-98+97-96+……+3-2+1
做得了多少就做多少!尽量多做吧!
1) 3/4+9 3/4(九又四分之三)+99 3/4(九十九又四分之三)+999 3/4(九百九十九又四分之三)+1
=1) 3/4+9 3/4(九又四分之三)+99 3/4(九十九又四分之三)+999 3/4(九百九十九又四分之三)+1/4+1/4+1/4+1/4
=1+10+100+1000
=1111
(2)1-1/2-1/4-1/8-1/16-1/32-1/64
=1-(1/2+1/4+1/8+1/16+1/32+1/64)-1/64+1/64
=1-(1/2+1/4+1/8+1/16+1/32+1/64+1/64)+1/64
=1-1+1/64
=1/64
(3) 1/3x7+1/7x11+1/11x15+……+1/55x59
=1/4*(1/3-1/7)+1/4*(1/7-1/11)+.1/4*(1/55_1/59)
=1/4*(1/3-1/7+1/7_1/11+.+1/55-1/59)
=1/4*(1/3-1/59)
=14/177
(4) 1/6+1/12+1/20+1/30+1/40 (最后应该是1/42)
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1/2-1/7
=5/14
(5) 7+77+777+7777+77777
=7*(1+11+111+1111+11111)
=7*12345
=86415
6) 8×(3.1-2.85)×12.5×(1.62+2.38)
=8×12.5X(3.1-2.85)×(1.62+2.38)
=100*0.25*4
=100*1
=100
(7)100+99-98+97-96+……+3-2+1
=100+(99-98)+(97-96).+(3-2)+1
=100+49+1
=150
=1) 3/4+9 3/4(九又四分之三)+99 3/4(九十九又四分之三)+999 3/4(九百九十九又四分之三)+1/4+1/4+1/4+1/4
=1+10+100+1000
=1111
(2)1-1/2-1/4-1/8-1/16-1/32-1/64
=1-(1/2+1/4+1/8+1/16+1/32+1/64)-1/64+1/64
=1-(1/2+1/4+1/8+1/16+1/32+1/64+1/64)+1/64
=1-1+1/64
=1/64
(3) 1/3x7+1/7x11+1/11x15+……+1/55x59
=1/4*(1/3-1/7)+1/4*(1/7-1/11)+.1/4*(1/55_1/59)
=1/4*(1/3-1/7+1/7_1/11+.+1/55-1/59)
=1/4*(1/3-1/59)
=14/177
(4) 1/6+1/12+1/20+1/30+1/40 (最后应该是1/42)
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1/2-1/7
=5/14
(5) 7+77+777+7777+77777
=7*(1+11+111+1111+11111)
=7*12345
=86415
6) 8×(3.1-2.85)×12.5×(1.62+2.38)
=8×12.5X(3.1-2.85)×(1.62+2.38)
=100*0.25*4
=100*1
=100
(7)100+99-98+97-96+……+3-2+1
=100+(99-98)+(97-96).+(3-2)+1
=100+49+1
=150
【急】!简便运算!(1) 3/4+9 3/4(九又四分之三)+99 3/4(九十九又四分之三)+999 3/4(九百九十
九又四分之三加九十九又四分之三加九百九十九又四分之三加九千九百九十九又四分之三
九又四分之三+九十九又四分之三+九百九十九又四分之三+四分之一乘三
九又四分之三加九十九又四分之三加九百九十九又四分之三加九千九百九十九又四分之三等于多少?
九又四分之三+九十九又四分之三+九百九十九又四分之三+九千九百九十九又四分之三 = = = = 1-二分之一-四分之一-
四分之三加九又四分之三加九十九又四分之三加九百九十九又四分之三 简便计算
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九又四分之三加九十九又四分之三加九百九十九又分之三加九千九百九十九又四分之三加一等于多少
4又五分之四*(四分之三+六分之八)-五分之四除以九分之二 运用简便运算
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