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97x30简便计算

97X30=(100-3)X30=100X30-3X30=3000-90=2910125X56=125X(8X7)=125X8X7=1000X7=700025X32X25=25X(4X4X2)X25=(25X4)X(25X4)X2=100X100X2=20000

90乘30加7乘30

您好,很高兴为你作答! 利用乘法分配律将它们合并同类项,就是38,再将因数相加,最后相乘. 理由:因为99和1这两个因数相加是个整百数,再乘99会很方便. 算式:99x38+38 =99x38+1x38 =(99+1)x38 =100x38 =3800

97x2.6=(100-3)x2.6=100x2.6-3x2.6=260-7.8=252.2

97x2929+4x29=(97-1+4)x29=100x29=2900125*(8+80)=125*8+125*80=1000+10000=11000(125*25)*4=125*(25*4)=125*100=12500

87*64+108*29 =29*3*4*16+4*27*29 =29*3*4*(16+9) =29*3*4*25 =8700

97*30=90+7*30=90*30+7*30=2700+210=2910

45*14=45*2*7=90*7=63097*30=(100-3)*30=3000-900=210041*26+59*26=(41+59)*26=100*26=260072*125=9*(8*125)=9*1000=9000104*25=(100+4)*25=2500+100=2600(125-50)*8=125*8-50*8=1000-400=600

1) 66x+17y=3967 25x+y=1200 答案:x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案:x=27 y=79 (3) 44x+90y=7796 44x+y=3476 答案:x=79 y=48 (4) 76x-66y=4082 30x-y=2940 答案:x=98 y=51 (5) 67x+54y=8546 71x-y=5680 答案:x=80 y=59 (6

97x12=(100-3)*(10+2)=100*(10+2)-3*(10+2)=1200-36=1164

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