Calculation of 41 + 59 * 12 with simple method

Calculation of 41 + 59 * 12 with simple method

41+59*12
=41+（60-1）*12
=41+60*12-1*12
=41+720-12
=720+41-12
=749

The simple method of 142 * 59-42 * 59 is

142*59-42*59
=59*(142-42)=59*100
=5900

Use a simple method to calculate the following questions. (1) 2.9 × 0.45 + 0.29 × 4.2 + 0.029 × 13 (2) 3.84 × 9.6 + 0.96 × 61.6

（1）2.9×0.45+0.29×4.2+0.029×13，=2.9×0.45+2.9×0.42+2.9×0.13，=2.9×（0.45+0.42+0.13），=2.9×1，=2.9；（2）3.84×9.6+0.96×61.6，=3.84×9.6+9.6×6.16，=（3.84+6.16）×9.6，=10×9.6，=96．

Simple calculation method: 75 ^ 2 * 3.14-3.14 * 25 ^ 2

75^2*3.14-3.14*25^2
=3.14×(75²-25²)
=3.14×(75+25)×(75-25)
=3.14×100×50
=314×50
=15700

A simple calculation method of (0.75 × 42.6-0.574 × 25 + 57.4) △ 3

(0.75×42.6-0.574×25+57.4）÷3
=(0.75×42.6-57.4×0.25+57.4）÷3
=(0.75×42.6+(1-0.25)×57.4）÷3
=(0.75×42.6+0.75×57.4）÷3
=(0.75×(42.6+57.4)）÷3
=0.75×100÷3
=75÷3
=25

How to calculate the simple method of 18 × 125 × 4

Original form
=（125×4×2）×9
=1000×9
=9000

Simple calculation method of 3.14 * 1.9 + 31.4 * 0.81d

3.14*1.9+31.4*0.81
=31.4*0.19+31.4*0.81
=31.4*（0.19+0.81）
=31.4

-0.21 * - (4.58) - 6.8 * (- 0.458) + (- 0.011) * (- 45.8) =? Simple calculation

=0.21x4.58+0.68x4.58+0.11x4.58 =4.58(0.21+0.68+0.11) =4.58x1 =4.58

What is the simple method of 8.8 × 2.9 △ 1.1

The original formula is equal to
8.8÷1.1×2.9
=8×2.9
=23.2

3.8-1.9 + 7.2-8.1 (78 + 58) △ 37 △ 15 = 40 - (7.7 + 4.8 △ 1.2) (329 + 113) × 13 × 29=

（1）3.8-1.9+7.2-8.1，=（3.8+7.2）-（1.9+8.1），=11-10，=1；（2）（78+58）÷37÷15，=32÷37÷15，=72÷15，=730；（3）40-（7.7+4.8÷1.2），=40-（7.7+4），=40-11.7，=28.3；（4）（329+113）×13×29，=329×13×29+113×13×29，=39+29，=68．