2.3×16+2.3×23
=2.3×(16+23)
=2.3×40
=92
原式
=23x24+25x36
=20x24+3x24+25x4x9
=480+72+100x9
=552+900
=1452
供参考。
2.3*(16+23+1)=2.3*40=23*4=92
原式=2.3*5.7-2.3*3*1.9
=2.3*(5.7-5.7)
=0
153*123+847*123+123=123*(153+847)+123=123*1000+123=123000+123=123123
7.2乘以0.2加2.4乘以1.4
=2.4×0.6+2.4×1.4
=2.4×(0.6+1.4)
=2.4×2
=4.8
5.7*0.11+11*0.743 =5.7*0.11+74.3*0.11 =(5.7+74.3)*0.11 =8.8
4.26乘以49加51乘以4.24的简便演算法
4.26乘以49加51乘以4.24
=4.24*49+0.02*49+51*4.24
=4.24*(49+51)+0.98
=424+0.98
=424.98
0.35x123-3.5x2.3
=0.35x123-0.35x23
=0.35x(123-23)
=0.35x100
=35
11x94+22x3
=11x94+11x2x3
=11x(94+6)
=11x100
=1100