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二位数乘一位数

12*213*916*717*824*911*423*729*844*5

10*2= 72-47= 20*5= 27+15= 20÷2= 63÷3= 27*5= 510÷3= 40*9= 23*30= 84÷4= 15÷3= 12*4= 513*9= 4*815= 99÷9= 75÷5= 205÷5= 46*10= 24*20= 872-124= 27+127= 700÷5= 350+70= 591÷3= 8*122=

1: 73*5= 2: 62*2= 3: 37*7= 4: 11*7= 5: 83*7= 6: 14*4= 7: 87*7= 8: 43*9= 9: 88*0= 10: 95*3= 11: 57*7= 12: 14*5= 13: 52*2= 14: 66*6= 15: 33*2= 16: 84*8= 17: 63*9= 18: 91*2= 19: 72*9= 20: 31*5= 21: 19*9= 22: 70*0= 23: 61*1= 24: 19*7= 25:

7*57,5*45,4*56,8*43,6,*13,4*85,8*98,3*67,8*34,5*45,9*15,4*69,7*64,9*46,8*86,7*,67,6*47,4*96,8*63,6,*87,9*95,9*65,7*57,2*64,9*28,3*86,7*81,5*29,8*51,7*79,9*54,3*48,8*57,6*48,7*63,5*86,4*27,6*87,9*34,7*85,8*58,9*34,3*91,2*94,4*65 不想写了,凑合着用吧

40.2x11=221.2x12=242.2x13=263.2x14=284.2x15=305.2x16=326.2x17=347.2x18=368.2x19=389.2x20=4010.2x21=4211.2x22=4412.2x23=4613.2x24=4814.2x25=5015.2x26=5216.2x27=5417.2x28=5618.2x29=5819.2x30=6020.2x31=6

口算2位数乘1位数一个两位数是20,一个一位数是8积是(160)20x8=160

1.十几乘十几:口诀:头乘头,尾加尾,尾乘尾.例:12*14=?解: 1*1=1 2+4=6 2*4=8 12*14=168注:个位相乘,不够两位数要用0占位. 2.头相同,尾互补(尾相加等于10):口诀:一个头加1后,头乘头,尾乘尾.例:23*27=?解:2+1

(1)89*3(2)36*9(3)28*6(4)46*8(5)73*9(6)37*6(7)59*2(8)95*6楼主是想考考自己计算能力,题不难,看楼主能多久做好.

2.55*7.1+2.45*7.1777*9+1111*30.64*25*7.8+2.2469*12+1492 5.67*0.2-0.62 (815-789)*785503+803*7 3105-668-332 (866-355)* 53936-686+1664 318+880-83*6 6545-538+55-625503-803*6 3105+668-332 (798-369)* 81000-125*86 (440-280)*(300260) (59+21)*(96÷8) (220-100)÷(15*2) 2520÷18*(806-799)

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