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63x98十126用简便算

63x63十63x35十126用简便方法.63x63十63x35十126=63*(63+35+2)=63*100=6300

=(x+y)(x-y)根据公式x-y,既可以知道:102x98=(100+2)(100-2)=100-2=9996

原式=62x98+62x2=62x(98+2)=62x100=6200

简便计算35+99X98十63=35+63+99x98=98+99x98=(99+1)x98=100x98=9800

65x98十30的简便计算 解:原式=65*(100-2)+30=65*100-65*2+30=6500-(130-30)=6500-100=6400

65x98十2的简便运算65x98十2=65*100-65*2+2=6500-130+2=6372

65 x 98 + 2 = 6372 可以用65乘以100 减65乘2,再加2.比如 65 x 100 - 62 x 2 + 2 = 6372

=64 x (98+2)= 64 x 100 = 6400

65x98+30=65x(100-2)+30=65x100-65x2+30=6500-130+30=6370+30=6400

87*128+126*64=87*128+63*128=(87+63)*128=150*128=(100+50)*128=100*128+50*128=12800+50*2*128÷2=12800+100*64=12800+6400=19200

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