急。。。谁能给我出20道分数乘法简算！！！ 谁能帮我出20道简便运算，要乘法的，要乘法
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(2/3+3/4)*12=2/3*12+3/4*12=8+9=17
(1/3+1/4)*12=1/3*12+1/4*12=4+3=7
(1/4+1/5)*20=1/4*20+1/5*20=5+4=9
(2/3+2/5)*15=2/3*15+2/5*15=10+6=16
(3/4+1/2)*4=3/4*4+1/2*4=3+2=5
(10/11+12/10)*110=10/11*110+12/10*110=100+132=232
(2/5+2/7)*35=2/5*35+2/7*35=14+10=24
(3/5+3/7)*35=3/5*35+3/7*35=21+15=36
(4/5+5/6)*30=4/5*30+5/6*30=24+25=49
(5/7+5/8)*56=5/7*56*5/8*56=40+35=75
(8/9+9/10)*90=8/9+90*9/10*90=80+81=161
(11/12+6/5)*60=11/12*60+6/5*60=55+72=127
(9/5+9/4)*20=9/5*20+9/4*20=36+45=81
(4/7+5/6)*42=4/7*42+5/6*42=24+35=59
(3/8+2/9)*72=3/8*72+2/9*72=24+16=40
(1/11+1/15)*165=1/11*165+1/15*165=15+11=26
(1/20+1/30)*60=1/20*60+1/30*60=3+2=5
(2/31+3/62)*62=2/31*62+3/62*62=4+3=7
(11/16+13/32)*32=11/16*32+13/32*32=22+13=35
绛旓細4/9脳4/3=16/27 1/3脳1/3=1/9 1/2脳1/3=1/6 2/7脳7/2脳2/7=2/7 21/25脳25/42=1/2 4/5脳3/4=3/5 8/7脳1/2=4/7 7/4脳1/4脳1/2=7/32 1/7脳1/2=1/14 2/3脳5/6=5/9 1/5脳3/8=3/40 3/5脳5/8=3/8 6/7脳3/2=9/7 5/6脳8/3=20/9 4...
绛旓細1.3/7 脳 49/9 - 4/3 2.8/9 脳 15/36 + 1/27 3.12脳 5/6 鈥 2/9 脳3 4.8脳 5/4 + 1/4 5.6梅 3/8 鈥 3/8 梅6 6.4/7 脳 5/9 + 3/7 脳 5/9 7.5/2 -锛 3/2 + 4/5 锛8.7/8 + 锛 1/8 + 1/9 锛9.9 脳 5/6 + 5/6 10.3/4 脳 8/9...
绛旓細娉曞緥 鎵嬫満绛旈 鎴戠殑 璋佹湁灏忓 鍏勾绾 鍒嗘暟涔闄ゆ硶 300閬 璁＄畻棰 瑕佺瓟妗堢殑 璋㈣阿 鎴戞潵绛 3...2x-20=4 3x+6=18 2(2.8+x)=10.4 (x-3)梅2=7.5 13.2x+9x=33.3 3x=x+100 x+4.8=7.2
绛旓細19. 9/11*(11/18+11/20)20. 2/5*(5/9+5/7)21.1/3*(5*(2/3))22.(1+37%)*20 23.35/2*75 24.30*(50/2)25.(54+10%)/20 26.(25/3*18)*30 27.(2+70%)*40 28.1/7*(98*(1/4)*2)29.25%*((23+2%)*4)30.(30+20%)/2 31.12*3/(25+20%)32.30/(3...
绛旓細璋佽兘甯鎴戝嚭涓鐧鹃亾鍏勾绾т笂鍐屾暟瀛鍒嗘暟涔娉曠畝渚胯绠楅 2.8脳5.6+3.4脳245 +280% 1.7脳38 +2.3脳38 2.64梅7+3.36脳17 +17 7.4+459 +2.6+549 24脳(512 锛38 +16 ) 0.125脳212 脳32 (89 +23 锛127 )脳27 1.25脳2710 +345 梅0.8 26脳21113 57 梅913 +27 梅913 23...
绛旓細1/2脳1/2锛1/4 1/2脳1/3锛1/6锛1/2脳2/3锛1/3 1/2脳1/4锛1/8锛1/2脳3/4锛3/8 1/3脳1/4锛1/12锛1/3脳3/4锛1/4 鈥︹︽病蹇呰鍐欓偅涔堝锛岃浣忚繍绠楁硶鍒欏氨琛屼簡銆鍒嗘暟涔娉曪紝灏辨槸鍒嗗瓙脳鍒嗗瓙锛屽垎姣嵜楀垎姣嶏紝鑳界害鍒嗙殑瑕佺害鍒嗐
绛旓細7 脳 5/49 + 3/14 2. 6 脳锛 1/2 + 2/3 锛 3. 8 脳 4/5 + 8 脳 11/5 4. 31 脳 5/6 鈥 5/6 5. 9/7 - 锛 2/7 鈥 10/21 锛 6. 5/9 脳 18 鈥 14 脳 2/7 7. 4/5 脳 25/16 + 2/3 脳 3/4 8. 14 脳 8/7 鈥 5/6 脳 12/15 9. 17/32 鈥 ...
绛旓細鍥炵瓟锛2*9 10*8 20*4 90*2 3*7 4*8 20*4 60*3 40*9 80*2
绛旓細2. 1/3脳1/3=1/9 3. 1/2脳1/3=1/6 4. 4/5脳3/4=3/5 5. 8/7脳1/2=4/7 6. 3/5脳5/8=3/8 7. 6/7脳3/2=9/7 8. 5/6脳8/3=20/9 9. 4/11脳3/4=3/11 10. 4/9脳3/8=1/6 涔橀櫎娉 1銆鍒嗘暟涔鏁存暟锛屽垎姣嶄笉鍙橈紝鍒嗗瓙涔樻暣鏁帮紝鏈鍚庤兘绾﹀垎鐨勮绾﹀垎銆2銆佸垎鏁...
绛旓細20. 3 脳 2/9 + 1/3 21. 5/7 脳 3/25 + 3/7 22. 3/14 脳脳 2/3 + 1/6 23. 1/5 脳 2/3 + 5/6 24. 9/22 + 1/11 梅 1/2 25. 5/3 脳 11/5 + 4/3 26. 45 脳 2/3 + 1/3 脳 15 27. 7/19 + 12/19 脳 5/6 28. 1/4 + 3/4 梅 2/3 29. ...
